SNESboy, you can't but xbox, you would have to by MS. i know nin is making alot, but nowhere near enough to by ms...
anyway, i think the MS will make another hd console, using motion control much like sixaxsis, but with rumble and would be put to better use.
sony will try a cheaper console, much like the wii. they will have hd capacity though, along with the motion controls.
for nin, i really don't know. mabey averything this gen combined for one kickass machine