i don't believe even X99 would have all USB3 ports
would be mixture usb3/usb2
Correct, my bad. It'll have 6 USB 3.0 ports, only now native to Wellsburg chipset rather than provided by a third-party. But I fully expect more being added.
I mean, if I'm not seeing it wrong in the picture up there, there's two USB 3.0 front panel headers (4 ports) on the board alone.
Cause they want you to buy a new mb everytime you buy a new cpu.
Sir, that is nonsense. See my comment above about DDR4. There's no physical space (nor any need whatsoever) to realise co-existance DDR3 and DDR4. And DDR4 is the main selling point of this platform - AMD will not have DDR4 till at least late next year.
Intel's once again using Xeon dies for their new desktop line, twelve core (Source (ocdrift.com)) at that. With little doubt, Haswell-EP Xeons with crazy amount of cores, will be compatible with desktop boards. This is not a gaming or layman platform. It is HEDT - serious workstations, home servers and show-boats. With that, I expect for 5970X or something to appear later when they get inevitable first release issues out of the way.