"Seems a given it'll be 60fps, but I'll be super impressed if they can maintain that in 3D, even at 720p."
Shouldn't be too difficult, though it would likely be 600p/640p. Halo and COD both render 60fps, and the primary reason they use the lower resolution is so they can fit two frames in to the 10mb edram for merging to render. Essentially they already run 120fps.
"Even though 1080p/60/3D is technically impossible on current HDMI, I seriously doubt any game will pull that off, even next gen."
It's not that hard. Really though, if they can do 1920x1080/60, dropping to 960x1080/60 to gain 3D is a fair tradeoff. Humans are far more sensitive to vertical resolution than horizontal, so the largest noticeable difference will be slightly more aliasing on the small percentage of high contrast lines at almost-vertical lines. FXAA can handle those quite well with minimal performance impact.
Hoping for 1080p/60 out of the next consoles is a fantasy though. 1080p/30 is going to be the standard, and the Wii U is quite likely to only do 720p/30 as the norm.