4-6 Processor Macs? AMD Macs?

MacBidoulle (English Translation) reports on a rumor of the upcoming Rack-Macs:

They clalim that the video will be average (as appropriate), but with lots of processing power... 4-6 CPUs.

Meanwhile, another French Mac site... MacPlus.org (English Translation) claims that Opteron (AMD) may find it's way into a Mac in the future....