The two most touted coming advancements are the "quadHD" and 3D sets. The problem with both that will massively slow adoption rates are two fold-
-People have just purchased digital TVs and are not going to run out and spend another $2000 on another TV when they're still not truly seeing the benefits yet with regards to really great HDTV (1080p on most signals, be they satellite or cable; signals that aren't compressed to terrible levels to reduce bandwith)
-Broadcasters just laid out large dollar amounts on transmitting HD signals and are already complaining about not recouping the costs within 5 years. Now go to that broadcaster and try to have him lay out more capital expenditures to either go quadHD or 3D? Not gonna happen. Maybe on the top tier, premium channels like HBO, Showtime, etc., but not your local broadcast stations or even TBS, TNT, etc. And tell them that this won't do any good until people purchase yet another set? Um, in short, no.
And don't forget that 800 pound gorilla in the corner of the room who's name is 'the current economy'. No matter what happens, it's going to be 3-5 years before the public at large is clear of this financial mess and has the equity in their house back and feels comfortable enough to make a purchase of that level. There was just an article over at arstechnica.com about the current state of OLED's. The short answer - don't go saving your money. There manufacturing facilities aren't even in place yet to produce these things on a large enough scale to put the price point at something consumable to the mass market. And no manufacturers right now are even hinting at retooling any of their plants to do this until the economy picks back up. Hell, right now they're closing plants, not upgrading them.
What would be nice in an ideal world would be to see everyone involved in the creation, production, and transmitting of media to focus on quality and ease of delivery. Let's get the current product looking at it's best, then move on to whatever the media conglomerates claim is the next big thing.