Power 5 is coming

IBM shall announce today the release of their first Power 5 server unit.
This new chip would perform quite better than the Power 4 it replaces (and from which the G5 comes from)
One most expected feature is, like on Pentium 4, the hyperthreading system, ie the ability to use a CPU like a Bipro. As the Power 5 has two cores (2 CPU in one), the system would see 4.
Apple shall use the PPC 975 in the near future, which derivates from the Power 5.
Knowing what difference there is between Power 5 and Power 4, in terms of performances, should allow us to know more about Apple's global future.