Aikouka
Lifer
Except the iPad 2.
I don't think we can make this statement right now. Unless there's been some released information that I haven't seen, we don't know much about the GPU other than that it can handle some game with some creepy clowns and a rolling ball. 😛 I don't think nVidia would make the same mistake again and release a SoC with a GPU that only barely beats (+15%) the current competitors. It's also interesting to consider that the PS Vita will be out in December with a more accessible GPU (being in a console) that (theoretically) has 2x the power of the MP2 (given it's the MP4 😛).
Although, I don't think a powerful GPU is all that you need at this point. I think that nVidia needs to go into collusion with some fairly iOS-dedicated companies like Epic Games and get them to support Tegra Zone. It seems that Epic's only qualm is that there's simply too many hardware options, and becoming specific to Tegra would work to stop that.
Unfortunately, it also segregates the Android market. :|