Apple's Mac Pro depends on Intels roadmap. If Intel doesn't update, Apple can't update the Mac Pro.
The MacPro could use some more love than just an upgrade of its CPU's and chipset - after all it's supposed to be a professional workstation (at least that's what everyone keeps saying over and over again). Just to name a few topics:
- More drive slots with native support for 2,5" drives
- Hot-swap capability for internal drives
- Native support of RAID-5 et. al. out of the box
- Native support for eSata / USB3 (arguable, but Thunderbolt peripherals are not actually flooding the market and currently you can't even add TB support on existing MP's)
- Case re-design ("handles", port locations more to the top for better accessability when standing on the floor, smaller in general)
- Getting rid of the screws on hard drive sleds and PCIe-card retainer (standard in other workstations - so no black magic involved)
- Better support for good/professional-grade graphic cards (the current implementation allows for only one slot with full 16 lanes, choice of hardware is scarce at best)
- More than 20 lanes in total for PCIe (even the MP1,1 had more)
- Better SSD support out of the box (without blocking one of the existing drive bays, e.g. similar to the blade-type SSD's found in current Apple notebooks)
- Support for bootable PCIe SSD implementations
- PCIe 3.0
- 89PLUS PSU
etc.
In my opinion the MP currently is neither fish nor flesh: For a really good workstation it misses out on too many details and for Mac fans that just want more expandability than Ram and 1-2 harddrives (the latter even being unnecessary complicated on the iMac and Mac mini) it has become a little bit too expensive.
Sorry for being OT!