TV companies need to sell you something new or else they couldn't keep marking the new things up.
3d is extremely useless. It's only as good as the media provided. Not to mention, 3d is gimmicky. They tried it with Jaws in the 70s, then rehashed it today with Avatar, etc.
In a huge theater, 3d is decent and has some impact...on a 70" in your living room...not so much.
Now they have the curved tv...utterly useless again. 16:9 ratio tv's made sense, as most movies are shot this way or even 2.35:1.
4k is great, but not really utilized on smaller sets. Also, how much media is out for it. I was just telling this Bestbuy joker the other day how useless it is for a few years.
OLED, better looking by a little, but the huge jump in price is clearly not worth it.
ULTRA thin, more marketing bs. How thin do you need a tv in reality? The wall mount will likely prevent you from making it fit very tight or even better, component to your system beneath..if that's your set up.
HD and flat panel were the only 2 advanced worth mentioning in a little more than a decade. The others, just circle jerking.