So, this has been out for a couple months now, right? Has anyone seen it?
Anyone know if it’s going to be shown on TV (presumably, ABC)?
No, it won’t be seen on TV. It’s far too short.
You’re just not thinking right. It’s a commercial-rich format. 
Seriously, though, there is no reason they couldn’t add enough fluff (interviews with characters or something) to get it ~20 minutes.
There’s very little that can be discussed if there’s no spoilers.
It’s a DVD (slash blue ray) extra. That’s it. Of course you can find copies of it in the dark alleyways of the internet. But. It’s strictly a DVD extra. I’ve seen it. It’s interesting. Answers some questions (Room 23, Orientation film aliases, Walt, supply drops, Hurley bird, pregnancy issues), and presents some character closure (Walt, Hurley + Ben as island leaders). But it’s not a panacea.
I suppose it’s theoretically possible that it might be added to syndication given that the finale doesn’t fit into neat divisions of hours as it was originally aired. But it recently aired in syndication and instead of including the extra stuff, it just cut out some of the finale.
I liked it. I was happy with the extra answers, without being disappointed by what it didn’t cover. I’m a little less satisfied with the Lost Encyclopedia. But perhaps I’ll save that for another thread…