Think it is safe to say if they have a chance to make a new GTA game they will make it ahead of any game. Agent has supposedly been talked about since 2007. Which means in that time it has been pushed to the side for other projects.

I have a feeling Agent will become one of those games that we will continue to not hear much about.

It was only properly announced last year, because they probably put it into full development. Rockstar North have also been helping with RDR (I am not 100% certain on that one) and they have also had to work on the Episodes from Liberty City.

A new game may be announced this year, but I would be surprised if it came out any time before Winter 2011 and very surprised if we got any proper info, a trailer at most