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From SOHH.com:

Hnnlive.com also reported that Detox is said to have a featured guest on every track, and that there’s a possibility that Scott Storch will act as a co-producer for the album; if that is indeed the case, I’m pretty sure it won’t do much to curb the rumors that Storch frequently acts as a ghost producer for the good doctor. Bishop Lamont and Eminem will be included in the guest roster, and it’s rumored that Lloyd Banks, Snoop, Jay Z, Diddy and The Game will also make appearances.

Well... SOHH's blogs report a lot of crazy stuff in regard to Diddy, so I don't know how to take this. But, worth a mention, anyway. I've heard something about it once before, as well.