A US patent filing from Sony for a standard PS Move-like controller that may remodel and roll out has come into notice. The patent describes a controller that would attach to additional “blocks” that may modify the feel and performance of the controller.
The patent shows 3 samples of how this would work: A block could extend to make the Move controller function as a sword, or rotate to provide it the handle and feel of a shotgun. Add on another block for a secondary handle and the shotgun becomes a rifle.
Keep in mind that patents are simply patents, and there is no guarantee that the customers will ever see a product like this that they might really purchase.