The range of Sony's W/R-series might be more interesting:
32" ($549-649), 42" ($799; does exist outside of the US),
50" and 60" ($999/$1499). Sony also has a 70" of it for $2499, but that one should be the TV equivalent of the 17" MacBook Pro.
A) They pretty much constitute what we'd call an iTV if they could connect to iTunes (they just connect to Sony's Entertainment Network instead, they have their user manual built-in instead of not requiring one at all and the software they run is decent instead of insanely great).
B) They already come with a slight price premium compared to similar models
C) Except for Sony's Entertainment Network, 4K content is pretty much nonexistent.
However, by the time Apple would actually release something like that, it would probably 4K.
The only problem I have with the whole iTV topic is more general in nature: Sony's pricing doesn't treat =$, so these TVs actually cost the same in Europe and the US (Apple's $749 = 749 while Sony's $749 = 569, taxes factored in). That's just deliberately giving up marketshare.