Although I'm fairly certain I suggest that you wait for vB's official word. You may also consider using their Support Ticket if they don't get back to you within 24 hours.
For myself, I wanted to use 1 database for multiple domains. I'll need separate vB licenses since the only common denominator will be the user logins. It has been done before but 1) It's not officially supported by vB and 2) I don't know exactly how to do it...Then again, I didn't look deeply into it (yet).