Turns out he really was a clubhouse cancer.
Read this article on mlb.com. There are quotes from teammates Ryan Dempster, Reed Johnson, Ryan Theriot, Derek Lee, and Aramis Ramirez.
Bradley won't be coming back.
This reminds me very much of Sammy's departure. The Cubs finally say "Enough!" and do it in a very public way, thereby diminishing the value of the player to a point where they can't get anything for him. On the other hand, in this case, there isn't a GM in baseball who doesn't know about Bradley.
At this point, Hendry will take a bag of balls for him.