I anticipate much more information about the new challenge coming soon. For the meantime, Diem posted this picture from US Weekly about the upcoming challenge. Of course, she blocked out the good stuff with Miley Cyrus’s face.
Perhaps this is our first taste of the official cast photos!
Stop Being Polite 
Diem said it airs July 10
Plus MTV has confirm the Rivals II cast officially:
http://remotecontrol.mtv.com/2013/05/30/challenge-rivals-ii-cast/