I'm not sure what you mean there

? Where did i mix up PCI-X and PCI-E? I was stating that the pro systems use PCI-X now, since these are aimed at pro's im going to assume PCI-X has some uses so what about pro's with current PCI-X hardware? Is that backwards compatible with PCI-E?
Hmm yes i know PCI-X is already on the PowerMac

. You saying that Apple would mix PCI and PCI-Express on a board?

I think the architecture will have to be redesigned in order to make any use of PCI-express. Im concerned that we will get a PowerMac with 4 PCI-E slots (one for the graphics) and no PCI-E hardware out there to make it useful.
I believe AMD are moving to DDR2, they just have not jumped on the bandwaggon yet since it made no odd's to performance. The biggest advantage to DDR2 was higher FSB and lower power requirements. I'm just not sure how this would benifit current PM's... i guess Dual Core's could put that extra bandwidth to good use but still.
Well if DDR was just as fast, then thats fine with me. Technology has to develop indeed, but it has to provide some sort of advantage over the previous offering.