Sata III? I doubt it.. faster ram? Doubt it also.. but who knows.. we will wait and see.
SATA 3 would require an additional chip, as would USB 3.0 since the X58 and 5520 chipsets are also used in the Gulftown based systems (i.e. no new chipset that supports either of these features have been released yet).
Apple's not added any feature but FW this way (as a result of their involvement with FW's creation), and even FW S1600 or S3200, would require a PCB revision, as the package (pin outs) are different. A PCB revision would also be required to add in a 3rd party semiconductor for USB 3.0, SATA 3, and increase the DIMM slots per CPU (just trace work here, and a couple of extra DIMM slots to solder down, as there's no physical space for more than 6x per, given the PCB specification used - SSI CEB + daughterboard).
As per the DIMM running at 1333MHz, it's possible. Unfortunately, not all of the current parts can run at that speed, nor will the Gulftowns. So even if Apple changes the firmware to support it (SPD timings rather than a fixed value), they'd still stick with 1066MHz to keep the parts bin as simple as possible (cheaper). As a result, I don't think they'd be willing to put in the time to change this (and assuming ROM capacity was never an issue that prevented anything but a fixed value to begin with).
If anything, we might see a new case, as there's no need to redesign the PCB's at all. Just flash with newer microcode to support the newer parts, and it's ready to go. Quite easy to stuff existing boards into a new case.
All of this translates to additional cost, that I'm not convinced Apple would take on, as the history suggests this is their usual take on such things.
SATA III would be a great addition. There are some SSDs that exist now that almost saturate the SATA II bus. I can only imagine the speed of SSDs in the next couple of years. It would be nice to have a Mac Pro that could take advantage of future fast SSDs.
I agree, but I wouldn't expect to see this happen, as so far, Apple's relied on the chipset to provide the SATA interface in the system, and the chipset won't change this time around. So that's still going to be stuck at 3.0Gb/s (same is true for USB, as it will still be 2.0).