more Wireless (wHDMI etc), OLED, and 4K resolution. And I'm sure plenty more down the road.

As for the 3D side, 2D image quality should be the exact same on any display requiring glasses. The only difference for 3D is that 2 different images are rapidly alternated between, with the glasses taking care of blocking one of the two images for each eye. For the ones that don't require glasses, some 2D issues may crop up, since it would still likely have to present 2 independent, but identical images.

Viewing angle matters on the TVs that don't require glasses because they still have to present unique images to each eye. I'm not sure of the specific tech used these days, but past attempts have used [http://en.wikipedia.org/wiki/Lenticular_lens]Lenticular lenses[/url] directly on the screen.