It's strange, out of all the older PS360 ports i expected NG3 to be the best performing, simply because they were spending so much time actually improving the core game.
Why they wouldn't throw some AA on it and clean up the textures while they were at it really surprises me, maybe they ran out of it's development budget, or time, or maybe a combo of both.
I wouldn't expect ANY of the other multi platform games to look or run any better on WiiU, BO 2, AC3, Fifa 13, Madden 13, Sonic Racing 2 ect are fast, cheap ports for launch to try and get another few hundred thousand sales on a new platform.
WiiU getting next gen multi platform games will be far more to do with companies willing to bother rather than the hardware being able to handle them imo.
A lot also depends on how many consoles they get out before March next year, if they can get close to a 10 million install base the console will be very hard to ignore.
The power gap will likely be 4x at most from WiiU-PS4/720 rather than the 10+x the Wii-PS360 was.
I think Watch Dogs will be the first game to show any real leap in terms of difference between the PS360 and WiiU versions but there is already talk of it appearing on PS4/720 at launch so those will obviously be the best looking / running console versions.