MotionPlus is out on June 11 and will set you back $30. It clips onto the base of your Wiimote to enable finer motion control.
Wii Sports Resort follows six weeks later on July 23 in a $100 bundle that includes the MotionPlus accessory. The successor to Wii Sports adds a bunch of new events, including jet skiing, swordfighting and, er... playing catch with your dog.
So what's the point in buying MotionPlus on June 11? That's when EA's Grand Slam Tennis is out, the very first released title to support the
extra waggle more advanced motion control afforded by MotionPlus.
Other MotionPlus-supporting games, SEGA's Virtua Tennis 2009 and EA's Tiger Woods PGA Tour Golf 10, will release in the following weeks.