Someone just asked about PowerPC support on the RHEL6 beta mailing list and I replied back with a subscriber link to this article. I assumed that the PowerPC would not be supported in RHEL 6 but it appears that is not the case as they have come out with a PPC release of RHEL 6 beta.
As mentioned it is only for server hardware, primarily the IBM pSeries.
See this post for more info:
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