Not really surprised by the performance level ...
These systems should be able to produce a moderate boost in graphics quality while rendering at 720p@60fps or 1080p@30fps, and would have a fairly minimal improvement over the previous generation at 1080p@60fps. For developers who really wanted to push more advanced graphics these systems may be able to give them what they want at 720p@30fps.
Ultimately, I see little reason to believe that most developers would find it difficult to produce games for current systems (including the XBox 360, PS3 and Wii U) and these upcomming systems if this rumor is true.
While I could be wrong, I would expect the jump in graphics from the Wii U to these next generation platforms would be similar to the difference between the PS2 and the Gamecube or XBox.
