In the official canon of the Star Wars novels, is there a story that is considered the “official” tale of what happens after the events of RotJ?
If so, can I get a TLDR version of the premise (but no spoilers, please).
The closest you’ve got is the Extended Universe - less canon than the movies, but still canon. The new movie might just ignore the EU entirely.
Anyway, the original contender for the Episode 7-9 movies was the Thrawn Trilogy, novels about a Grand Admiral with a gift for strategy and psychological warfare who was trying to rebuild the Empire, and the Rebels’ attempts to stop him.
We should be so lucky! That was a great Trilogy!
They are really missing the boat by skipping Thrawn, but the main issue there is the fact that the trilogy revolves around Luke, Han and Leia, all of whom are a bit the worse for wear these days. If they are going to have to recast the roles, better to go with all new characters. Star Wars fans aren’t the most forgiving folks, after all.
A lot of it is out of continuity now, though, thanks to the prequels.
Boba Fett pretty much invariably gets vomited out from the Sarlaac… you just can’t keep a good character dead. 
The first time I saw that plotline was Marvel Comics’ first post-RotJ Star Wars issue. Had an awesome cover too.
Really, the answer is “Well, how far do you want to skip after the events of RotJ?” There are Extended Universe takes on everything from a long time ago even from that long time ago, all the way to years and years into the future, and everything in between. There’s enough out there to detail the state of the universe in relative chronological order and in enough detail up about 25-30 years after the last film (with stuff after that point being generally stand-alone works), so really, there’s a massive amount you could technically draw from. You could go with the Thrawn trilogy (which I agree would be great, but isn’t happening) which is very, very close to RotJ, or you could do a similar time jump from the Prequels to the Original trilogy if you wanted to.
Nothing is the canon story, though. SW EU fiction is so large at this point that there’s different accepted levels of canon beyond “yes/no”. They could come up with some entirely new story (which i’d guess they will, or at least something very loosely based on the EU in general), and then that would be canon.
As long as there’s no Yuuzhan Vong, i’m happy.
I’d love that too but I would think the books are way too huge and complex to by condensed into 3 two-hour movies.
Why then just give them The Hobbit treatment! A trilogy of trilogies, each a trilogy of hours long! 
I’m not a big Star Wars fan and I’ve only read one of the EU books, but I wonder if they’re going to throw the fans out for the public at large. I can’t really conceive of post Episode 6 without Mara Jade, Jaina, Jacen and Anakin because even though I haven’t explored the EU, I was in elementary school when the Thrawn Trilogy came out and it’s been something I’ve grown up with a knowledge of. But I’m getting into spoiler territory here 
Yeah, I’m trying to think of a non-spoilery way to explain even the events I know about (asking for a summary of the EU at this point is almost like asking for a quick summary of the book voyages of the Starship Enterprise), but it all comes out pretty randomly generic.
The Empire does not, in fact, just completely poof in a puff of smoke after RotJ. They, along with various other evil powers, provide a ready string of superweapons or other galaxy-spanning threats that need to be taken care of.
Over time, most recognizable characters from the trilogy get married and have kids. Parents that are from force-sensitive lines have kids that are force-sensitive. As they grow up, some of these kids get tempted by the dark side, causing more plot tension.
Overall, there seems to be a lot more death of major characters in EU fiction, even characters from the original trilogy are not immune.
The thing is there is no “official canon” that the people making the next Star Wars movie feel they have to abide by, except the 6 existing movies. And even then, things can be changed, “Oh, you thought Darth Vader was your father? Yeah no, that was actually a trick, what really happened was blah blah blah…”
I really hope they don’t use Thrawn in any way. He annoys me in every way that Sherlock Holmes annoys me - in particular, where all of his arguments are presented as iron-clad deductive logic that cannot be wrong, when they should really be presented as a series of reasonable guesses with a certain statistical confidence level. But even a high confidence level mean you have to be wrong sometimes.
Overall, I find myself hoping they won’t do any more movies. If they do, I’d much rather see something like the Rogue Squadron novels - something that doesn’t involve the major canon characters or events to any great degree. That way, we can avoid any further stupidness like having C3PO be Darth Vader’s childhood science project. Any new stupidness can at least be self-contained into the new movies.
It won’t be episode VII, but I would dearly love for Tales from the Mos Eisley Cantina to be made into a miniseries. If you ask me, this collection of stories that intersect only at the cantina scene was the best of the Star Wars books.
This video may help.
Nitpick: 8 existing movies, not 6.
Annoying nitpick: 3 existing movies.
Eight? Are you counting the Ewok Adventure?
The issue with Thrawn was that he wasn’t actually evil at all, but was merely an extremely competent non-human high-ranking Imperial commander, and the last real unifying force to the Empire. In many ways, Thrawn was quite enlightened by the standards of Imperial admirals.
That would probably be too complicated for a Lucas Star Wars film, so they’ll just go for some mustache-twirling clearly evil bad guy.
The guy who runs the Holocron Database (used by Lucasfilm Licensing), Leland Chee, came up with a system using different levels of canon. Each one can co-exist with the others but if they overlap/contradict each other, then the higher level “wins” out:
G-Canon (for “George Lucas”): the six movies, and any statements/works George worked on. Newer version of the movies supersede the old ones.
T-Canon (for “television”): TV shows like The Clone Wars
C-Canon (for “continuity”): All the recent tie-ins, such as comics, video games, books, etc. Some (especially the games) may only be partially canon (for example, what name/gender the player character is). May include some details that later become G-canon, such as “Coruscant” for the name of the capital planet
S-Canon (for “secondary”): Older tie-ins that pre-date attempts to fit into an overall continuity, such as the Marvel Star Wars comics. May fit in, may not.
Non-Canon: stuff that is purposely non-canon, such as the Infinities comics.
Obviously all this stuff could go out the window under Disney’s watch. My guess is the new films overwrite the EU stuff, and we end up with a lot of EU going the way of Marvel (or maybe being spun off into it’s own “continuity” branch with the new movies making up a new one.)
Yes, of course. Why wouldn’t I?