Looks interesting, not sure what "deep" MicroATX is other than being out of spec for MicroATX by about 19 sq. inches. I like the high core count of the Xeon processors but 15x price premium over top of the line desktop/or enthusiast CPUs is hard to justify for anything outside large corporation or research activity.
Old hotness: Building a computer in a huge EATX case with lots of room to work, multi-gpu SLI, and massive airflow for overclocking that fits (12) 3.5" HDD.
New hotness: Building a computer in custom mini/microatx form factor w/ watercooling and massive amount of cores and memory running nearly silent