I got 3 (both thumbs, right index) and my wife got 2 (both thumbs).
Was really hoping they would expand that to say 10 in this generation. It's already bit me a few times using the wrong finger.
I have heard that you can kind of hack it to read more by using multiple fingers on one entry, when scanning for setting it up. But obviously that seems a questionable path to take; even if it works, may lead to reduced accuracy.