After weeks of sleuthing we have finally put all the pieces together and are ready to announce the compete compliment of Real World cast members for the upcoming season that concluded filming in Hollywood on the 11th of December (and will air April 16th)
Updated Spoiler Thread Real World Forums Real World Hollywood Trailer (One Minute Preview)
Each cast member is linked to their own individual page which includes additional pictures and information (such as myspace and facebook accounts) as well as a variety of uncalled for snap judgments made by the ever critical members of this community discussion venue.
After a series of events in October Greg, then Joey left and were replaced with:
Nick Brown 
Brittini Sherrod
Note: I have sent an email to my contact at MTV Networks concerning this cast list and they have not yet responded to my inquiry. I will update this thread when and if they do.
Update 1: I just heard back from MTV about the cast list I provided and they said, "we are not confirming any details at this time about the new season and the roommates" which of course is code for "Great list, you got all nine before filming even wrapped. We are really impressed!"
Update 2: I have received conformation from a source close to production that this is indeed the correct list.
Update 3: I have received conformation from a source close to the cast that this is the correct list.
Update 4: Fixed Will's age (24 from 25)
Update 5: Cast will be officially announced during the MTV Real World Awards.
Update 6: Season in progress.