Radeon X1900 in the Future MacPro?

The website hdforindies claims to have obtained information from reliable source that the future Apple Pro desktop models, aka Mac Pro, will feature the Radeon X1900.
If this information turns out to be true, it would signal ATI's comeback in Apple Pro hardware models.
In addition, hdforindies reports that this high-end graphics card could also be installed in current PMG5. This could confirm information related to a possible double Pro hardware offer for some weeks or months from the Apple (PPC-based PMG5 AND Intel-based MacPro). It would not be new, since Apple also maintained the PMG4 able to boot on OS9 for months after the transition to "nothing but OSX".

JCJ