First of all, that picture shows no clue of being rack mount. Secondly, it looks like they ripped off this picture from 2008 and simply photoshopped out the optical drive.
I really don't care too much what it looks like - same size or smaller than my current 2008 3,1. What I do care about is what's inside. The usual suspects: USB3, SATA III, TB, a couple of slots for video and ESATA, lots of room for multiple drives, DVD (maybe, I guess I could live without it).