Nintendo is planning to release a combined Wii Remote and Wii MotionPlus accessory - The Wii Remote Plus - according to a GameStop listing for Wii title FlingSmash.
According to the boxart, FlingSmash will come bundled with the new Wii Remote Plus. It's not uncommon for MotionPlus titles to ship with the accessory and it makes sense for Nintendo to merge the tech with the standard controller.
Back in 2008 Nintendo said it was considering doing just that.
FlingSmash is currently without a firm European release date. For more on the game check out the trailer from E3 2010.