A while back I came across these specs for the Revolution...
2 G5 1.8GHZ CPUS
512K L2 Cache
1200 MHZ Front Side BUS
600MHz GPU with 12MB embedded 1T SRAM
128MB 1T SRAM MAIN MEMORY 600 MHz (L3 Cache to CPU and GPU)
256MB 400MHZ NEC design embedded DRAM
Embedded 16-BIT HD 7.1 Digital sound chip
Dedicated sound bandwidth will not affect CPU
6GB HD Dual Layer Panasonic Discs
3:1 balance between CPU and RAM
1:1 balance between GPU and RAM
Got them from this site...
LINK
Obviously they could be totally bogus as nothing has been confirmed officially by Nintendo.