I'm planning to get a new build going too. It's going to take awhile for it to come out. Motherboards will have to support it first and then there are new CPUs coming out dedicated to Socket M2 next year. If you can wait that long, then it's nice having the new stuff. Think at how expensive they would be though!!! You can just imagine the prices on current X2 CPU's drop in price big time as well as current DDR RAMs.
The stuff we have now runs great but performance gains on the new stuff looks promising. It's a tough choice to make. Perhaps you can build a PC now and upgrade later or use the new techonology to build another new PC and network them.