I just upgraded my newbb to 2.0 and I'm wondering are there any uses for HP, MP and Experience? (Expect them being there and looking cool)

It looks RP like.

In my opinion for now they just look cool. It is theoretically possible to use them as triggers (based on the values) for something..
eg.
at exp 8 you could grant content to a special piece of content (which validated the users exp level prior to granting access) and trigger a PM to the user... big pain in the horse apple though.
BTW you can change the names (MP EXP HP)in the newbb lang folder i think, you can search the forums there is a post about it somewhere.

forgot one thing,

You can require minimums in order to read posts...
you need to set it when you create the post.