does xenforo provides some kind of statistics in the admin panel, for example charts of the number of registrations, posts, topics, searches, any thing that can be useful to a webmaster to follow his board evolution
There is analytics integration already, which means you can easily add funnels in your analytics to track registration and new threads as separate conversion rates... I don't really know what other stats are so important and must be tracked and calculated locally when the cpu resources could be used on serving contents
It will require a bit of testing and poking around... I think XF's registration process might actually be a bit harder to track since both /register/register and /login/login can act as the registration form. But you can probably still do it by using two goals for /confirm/ (email confirmation), and one with step 1 on /register/register and the other with step 1 on /login/login.
Will need to wait for when the software come out and see, I guess.