In the Observer they say that it's likely Joanna's going to be the bad guy on TUF
"The new season of The Ultimate Fighter debuts on 4/20 and the buildup video looked like there were a lot of fireworks involved. What has come out is that the heat with champion Joanna Jedrzejczyk and challenger Claudia Gadelha was similar to Ronda Rousey and Miesha Tate in 2013. You can never fully predict the public, but there was a feeling that Joanna, who has gotten really popular since her challenging for the title, is the one who comes across the worst. There was also an incident, not on camera, where Joanna threw a water bottle at Gadelha and they got into a legit fight with punches and kicks being thrown. Dana White said that Joanna hit her with a water bottle but Gadelha said Joanna threw the bottle at her and missed, but she kicked Joanna which didn’t miss. White’s description was that it happened just after filming had ended. “Claudia goes, `Shut the f*** up.’ She goes, `I’m so sick of listening to your mouth.’ and they started going at it, and I pulled them apart.” The title fight is scheduled for 7/8 in Las Vegas, as part of three straight nights of shows for International Fight Week."