In terms of the games released. Most developers create a game based on the first platform of the generation. It's why when teh xbox came out, despite being more powerful than ps2, the games were worse in many cases, they were made for ps2 and then ported over.
This generation the reverse is true, they make games for the 360, and then they're ported over to PS3. The games are aimed at the lowest common denominator.
I will agree that there are some 1st party sony titles that don't make use of 1080, but at the same time the graphics on the PS3 were... sub par, basically a cut down 7800.
Funnily enough, early rumours suggested that once again the card would be equivalent to a cut down 7800, only this time it's an ATI.
Now considering a 7850 can get over 30fps running crysis 2 with res2560x1440, 4x AA, AFx16, Quality UltraHighRes Textures On
I imagine it could fairly easily play most games in 1090p at 60fps (note most, not all) likewise it could probably handle the grunt of a 3d game with relative ease.
At the same time however I also doubt this setup could handle 4k resolutions. Which is why I expect some form of crossfire to be used, Considering the CPU itself as an integrated 7660 onboard, throw in another graphics chip like a 7750, and it could be quite possible to get some games (but not all) running in 4k resolutions (although I'd expect 30fps at best). Or heck, possibly two of these, and use the graphics cores on the CPU to crunch physics calculations.