I totally didn't expect Apple to update the Mac Pro at this time. I still say they will wait for the Ivy Bridge Xeon update that will come late this year or Q1 2013. And when it does happen, *IF* it does, I think we have seen the last of the oversized, outdated tower.
Very crappy of them to advertise the Mac Pro as being "new". There's nothing new about it. It's causing a lot of confusion, I see people commenting on new CPUs and whatnot. None of that is true, the *ONLY* thing that has changed is they have upped the base configuration RAM from 6GB to 12GB.