The first official mention of Big Brother 8 was found on the Channel 4 Sales website...
Over at the Channel 4 Sales website, Big Brother 8 is listed as starting in May, the following is the summary:
“This summer a new set of housemates move into the world’s most famous digs. What will Big Brother have in store for them this time? From the moment the doors to the house close on launch night, the new group of housemates will be not only at the mercy of Big Brother, but each other, as they complete tasks, nominate and try to get along. Viewers will be able to watch their every move virtually 24/7 on Channel 4 and E4, as well as online. While the unexpected becomes the norm, there’s one factor that remains the same and that is eviction night. Who stays and who goes will be down to the viewer. Davina McCall will preside over the live eviction shows, while Dermot O’Leary hosts Big Brother’s Little Brother.�
So from this, it looks like Dermot will be back, but no sign of Big Mouth. Either they haven't found the replacement presenter(s) yet, or the show will not be returning...
Source:
http://www.channel4sales.com/program...asonal?genre=2