Architosh posts some speculation/interpretation about two posts regarding gcc.
The tentative conclusion is that IBM's PowerPC64 supports Altivec.
Speculation of the new chip started after a description of an upcoming chip appeared on the conference schedule for Microprocessor Forum 2002. Since then, rumors of Apple-IBM talks over the new chip emerged. PenguinPPC initially reported that the vector unit on the IBM chip was Altivec compatible, but that post has since been removed from PenguinPPC, which questions its original accuracy.