I'd prefer the TV to actually be the wall so that I can watch any content at any size (full wall, or little box) or have a bunch of different stuff up, e.g. different angles on a motor race, with a timing/scoring grid too and a circuit map with trackers on. And a weather report of the same area. And Twitter.
Or watch IMAX films on it full-wall, but normal TV a sensible size.
And because it's electric paper style there'd be no black bars. And where there isn't a screen up it can show wallpaper that's actually wallpaper! Or framed family photos.
Then you can embed a clever array of cameras and have screens up that are actually mirrors. Or Skype your entire lounge with your parents, so they can watch the kids playing on the floor in front of them from the other side of the planet.
I want all of that NOW DAMMIT!