ZPaul2Fresh8 made the MK2Plus public beta available to download.

This can be played on MAME or Hardware.

Some key features:
*Play as the hidden characters (after you figure out how to unlock each one)
*Random Fight ladder
*Endurance Fights
*Improved AI
*New Hidden fighter? Secrets?
and much more!

Turn individual options on and off in the service menu.
Check it all out at www.mortalkombatplus.com