Looks like Wii Sports Resort, which is basically Wii Sports: The Next Generation, will come bundled with the MotionPlus accessory, when it becomes available next spring. The MotionPlus attachment gives you 1:1 motion mirroring on your Wiimote.

No word yet on the price of the MotionPlus by itself, but the thinking is that people will buy Wii Sports Resort just to get the accessory just like with Wii Play.

[Gizmodo]