From the Could Be a Rumor Department...
A story on EuroGamer says that Rockstar is changing the name of Bully to Canis Canem Edit, Latin for dog eat dog. It also happens to be the motto of the fictional Bulworth Academy, where the game takes place.
Eurogamer is citing Rockstar itself as a source, although no individual is named. GP is withholding judgment on the veracity of this one.
Additional info from Computer & Video Games says that the change is for the European market only. Bully will still be Bully in the U.S.