If that high-level of integration between Vivvo 4 and vB is true, then that's truly great news

vBulletin has a beautiful built-in calendar, great polls, and hundreds of add-ons in the vb.org community like image gallery, flash video games, MySpace networks and profiles, etc.. vB recently introduced Blogs which is seamlessly integrated with vB, and they're now working on social networking in vB 3.7!
If you guys can get vBulletin's database and usergroup permissions working with Vivvo, the sky is the limit. Anyone could then build a site with almost any function just by installing Vivvo 4 and vBulletin 3