Hurrah! GPUs sealed directly into the machine. No more keeping old macs alive with extra GPUs. (the quadro 4000 and k5000 really helped the 2009 macpro)
It also appears to only have one CPU. From what the page says its only got one Memory controller, which as the "new"* Xeons have onboard memory controllers. So that seems a bit of a fail.
*as in the same Xeons that have been in the HP Z620/820 for the last 8 months
The only thing appears to be going for this mac is that it has nice disk bandwidth.
The Z series workstation is going to be cheaper, and almost twice as fast+. (assuming one buys the correct fusionio card.) it also has the advantage of taking normal pci slot graphics cards, which can be upgraded later.
It also appears to only have one CPU. From what the page says its only got one Memory controller, which as the "new"* Xeons have onboard memory controllers. So that seems a bit of a fail.
*as in the same Xeons that have been in the HP Z620/820 for the last 8 months