Nice. Tad expensive at the moment ~perhaps~, but in time, and a bit of msrp massaging, it could present itself a nice alternative.
Looking at the pcb, it would appear they'll be running a range with raid, standard single drive and external eSATA.
I'd possibly w8 for Lycom to show their models (only cos I have some of their cards already and they proved both cost effective and simply work).
With the existing cards I have, they work in x4, x16 slots too.