Per CagePotato:

NBC will finally made its foray into the world of mixed martial arts in September when it airs its Ultimate Women Challenge MMA reality show. 

The show, which was originally scheduled to run last fall, will be hosted by Bas Rutten and model and Dancing with the Stars competitor Joanna Krupa and will feature some new and some recognizable faces in female MMA including Jackson's MMA product Julie Kedzie and American Top Team trained fighter Jessica Aguilar.

NBC has dabbled in MMA before -- airing Strikeforce in a pay to play slot at 3AM on Saturdays. They were in talks for to air a weekly Strikeforce show on a more serious basis but those went nowhere once Strikeforce grabbed EliteXC's Showtime/CBS slots. Cage Potato also points out that the UFC's legal team is likely to object to NBC airing an MMA reality show with "Ultimate" in the title. 

Here's the promo: