For me, there is one defining proof that the Wii U is indeed next-gen. It has as much eDRAM as the XBone has eSRAM. In fact, the Wii U has slightly more embedded memory because it has a small chunk of eSRAM on top of all of this.
For perspective, the 360 has less than a third of that much eDRAM. The XBone only matches the eDRAM. The PS4 has no embedded memory at all (that we know of.)
The Wii U also has about 1.5 GB RAM available to games, which is three times more than the PS3/360.
Conclusion: The Wii U has more embedded memory than any other console in this gen or the next, so it is impossible for any of those consoles to play an optimized Wii U game without turning some settings down. Porting to the PS4/ One will be a wash at best.
To the PS3/360? Don't make me laugh. The Wii U's bigger chunk of RAM alone makes that impossible, even if the GPU is on par on paper. Textures would have to be deeply compressed, which would adversely affect performance on top of the porting loss.







