What will they class as offensive language though? The game is rated 18 (in the uk) so surely offensive language will be used. If a little boy dont like be swearing then they shouldn't play the game as they are under age. Also, They can clearly mute some one in game if they didn't want to hear them swearing.
Secondly, I reckon, they'll keep up with it to start with so it makes them look like it was a great idea blah blah blah then after a while they wont bother. Or, people will just report every one for stupid things like 'noob tube OMG' or a camper.