I don't think the current version did as well as EA hoped. The post release support for the current game seems to have been less than originally planned. While the game has a spot in the menu for DLC, none has been released (apparently there was one piece that was released briefly before being pulled though).
There is also less reason to make yearly releases with a game like this: unlike other EA Sports titles there are player rosters to go stale, the game is just as relevant now as it was when released. So perhaps they plan on doing a longer development cycle.