We knew this one was coming, but we didn't know the details. Nintendo busted out the new MotionPlus Wiimote add-on at its E3 keynote today. The device, which attaches to the rear of the controller, will be used to tighten up and refine motion sensing on the Wii, and its tweaks will be levied in a new game that the accessory comes paired with called Wii Sports Resort. The console-maker says the MotionPlus brings 1:1 sensing to the Wii, which will enable detailed control heretofore unseen on the system. We're getting more info (and hopefully a hands-on with the little guy at some point) so stay tuned.