XFCredits exists right now
get it from the first post! You can award per post and per hit.
As for the full port of vBCredits II Deluxe... that's still awhile away
There is a ton of stuff still to learn in xenforo, not to mention xenforo itself has plenty of bugs to work through (even one that affects this cursory version).
I will have a better idea on release dates once the gold version of xenforo is within sight.