Originally Posted by victim
Actually, all GTA's bar GTA IV have been released the same year as they were announced. That said, there won't be a new GTA this year, but they are no doubt working on one.
One interesting thing to consider: GTA IV took so much longer because they had to develop/modify a new engine, and build the new GTA on a 2 platforms. Perhaps, now that they are familiar, they can take the route they took with VC, SA, VCS, LCS, and just use the same engine with minor tweaks, and push a game out quicker.