I am tracking down Badspot's work on v15. It should be released around early october of 2010. Here is a list of the clearafications:
•sever player limits will now be up to 34 players instead of 32
•ports will now not have to forwarded for anyone
•new light "dim" will be default
•new pong projectile & bullet projectile
•new community map "slate_space"
•new music file "eggs"
•additional arch bricks
•crap-on catche fixes
•random model mound fixes
•loaded brick fixes
•texture breakdown fixes
[Note_ v15 is made already. Badspot needs to fix his torque engine fixes before he releases]