We know as much about the Revolution as we do the PS3 or Xenon..... Squat!
that's not true.
we know what media format PS3 will use: Blu-Ray
we know that PS3 will use some Cell-based processor, and we have outlines for what Sony wants it to be (the Broadband Engine made from 4 Processor Elements with 32 APUs seen in the Sony patents) we dont know what Revolution's main processor will be based on, other than that its coming from IBM, and that its probably PowerPC based. ok so we know a bit more about PS3's CPU than we do about Revolution's CPU.
we know what kind of external memory is going into PS3: Rambus Yellowstone, now known as Rambus XDR-DRAM. we don't know what kind of memory Revolution will have, other than
guessing it'll be the newer version of MoSys 1T-SRAM.
now here's where I start skating on thin ice:
we know PS3 will be monsterously powerful, going by Sony's statements all the way back to fall 1999. we don't know how powerful Revolution will be since Nintendo isnt getting into a spec war. i'll bet Revolution is fairly close to PS3 in actual in-game capabilities though. or at worst, it'll be like DS vs PSP, where the PSP and PS3 are far more powerful from a spec standpoint, but DS and Revolution can do things that PSP and PS3 cannot.
we know almost nothing about PS3's and Revolutions graphic processors, but, we know the basic outline of what Sony wants in PS3's GPU (again, the patents) but we don't know what Nintendo wants in Revolution's GPU.
we also know quite a bit about Xenon as well.