The Division was being delayed until 2015, but it's still nice to find out exactly why. After all, if you're looking forward to the game at all, you would like to see it sooner rather than later. Gamereactor recently spoke with the development studio, and the developers explained the core reason behind the delay as simply being a matter of properly exploring the concept rather than releasing an unfinished game on a tighter schedule.
According to the interview, the development team was upset at the original announcement of a 2014 release, as there had been no in-house discussion of release dates. The game's engine is quite powerful, but even the 2015 date may be overly optimistic, with The Division's multiplayer components still having major issues with implementation. Hopefully the delays will help ensure that the game is more polished and playable when it does release, whether that's in 2015 or later.