Will they also explain why Romulans now have ridges?
I think the real concern should be why do Ruffles have ridges?
Genetic drift over two centuries due to a smaller gene pool. And to hold dip better.
You pick which explains the ruffles and the other, the Rihannsu.
I don’t think it works that qiuckly. But what the hell, we’re pretending they can travel faster than light.
I think the Ruffles is due to the salt. Perhaps the Romulans, too.
Makes 'em better for dipping.
Maybe Ruffles are the same.
Romulans have ridges to enhance her sensual pleasure. 
I like Pakled Scoops™!
Hey! Who brought the Altarian dip? It’s gone bad.
Now, now; this is not the Pit. It’s the Altarian mentally challenged.
If the Romulans were due to the salt, does that mean that the M-113 Salt Creature was actually a Romulan?
She may have been ugly, but she did swallow.
I hate this whole “give Gene credit for everything.” From what I understand, he actually resisted changing the Klingons for “The Motion Picture.” One of the behind the scenes guys interviewed on the Special Edition DVD of the Trek films says they had to talk him into it. The ridges were based on mutated dudes from a failed Roddenberry 1970s crap pilot–forget which one maybe “Planet Earth”). They brought this notion to Gene, to make the Klingons look that way, he hated it. Years later, according to his wife, he loved it. Years later than that, he had always wanted the Klingons to have bumps as far back as 1966. Give me a fucking break!
Gene Roddenberry came up with a good space opera notion. Gene Coon created the Klingons and he and D. C. Fontana wrote most everything of importance for establishing the characters/themes/aliens for the series. Outside of “The Cage,” Roddenberry scripts were absolutely horrible.
Give credit where credit is due.
Sir Rhosis
Obviously, they stole them from the Trill.
The explanation that has always made perfect sense to me is this:
Kingons have always had forhead ridges.
As a viewer of the show, I like to pretend there’s a real Star Trek universe where this stuff really happens, but that we are seeing a T.V. recreation of the events in that universe. We can’t see them when watching the original series, but that doesn’t mean they aren’t there in the Star Trek universe. The only time we have ever been given any indication that something changed in the Klingons appearance was one scene in Trials and Tribble-ations, and that was clearly a joke. As far as I’m concerned, it’s a joke that was inserted by the writers – in other words, not something that actually happened in the “real” Star Trek universe.
I’m happy with this explanation. If they’re going to give a different one, it had better be a good one. Frankly, I think they’ll probably just end up making things more confusing.
As stated above in this thread, Kang, Koloth and Kor all showed up in DS9 with bumpy foreheads, whereas in TOS they looked like the constipated mongol Klingons.
I did have to wonder, though, in the original Trouble with Tribbles why the impostor had to have surgery done to hide the fact that he was a Klingon. Compared to the CM Klingons, all he had to do was shave off the goatee, pluck his eyebrows, and use a good skin cleanser. For this he needs surgery?
Well, there’s the ugly factor…
Maybe to plug the sebaceous glands on their skin that secretes the vaseline that all Klingons in TOS are covered in?