This looks so cool! I'm really looking forward to seeing a beta. I could really make use of the product with more of a hosted focus as I run a hosted system for about 70,000 users. More of a focus on making the hosting easier is great.
I'm a bit worried about the self-administration stuff unless you can put some format-checking in place. For example, letting anyone type in whatever for a phone number could kill having OCS work correctly for calling. I know that these features won't be required to turn on, but making the phone number come out as a +1 (123) 555-5555 x123 format, for example, would save a lot of headaches. The current forms looked like you could make your office phone number "AT&T"! This wouldn't be very useful.