The Inquirer's got the write-up, which includes two sources of the leaked specs. Looks like three IBM PPC CPUs, & an R500 core. Interesting...

"Being reactionary is not a good thing, look at Windows, but doing so in hardware is near suicidal. Lead times, and the fact that developers need targets to write to all conspire against changing console specs in the slightest way. This could cause pain for many on the software side."