According to CVG: http://computerandvideogames.com/article.php?id=230532
Now this is no confirmation, but there is a chance (and a high one at that). Now I personally think that 2K will want to really show off Mafia 2 at e3 this year and really put all the spot light on it. Get the consumers really hyped up for it. But could it be over-shadowed with the announcement of a GTA 5?
It's unfortante but true that Mafia 2 will always be compared to GTA. It will be really sad to see a random person come up to Mafia 2 this june at e3 and say "hmm this looks alot like GTA 5"...and just pass it up.