Nintendo made motion controls much better with the addition of the Wiimote MotionPlus controller and attachment. The same technology is found inside of the Wii U GamePad, but the new console also supports older Wiimotes, both with and without MotionPlus. The latest info from Game Informer suggests that Nintendo isn’t pushing developers to use the new and better Motion plus tech. Instead, developers are free to use the older technology if they wish. However, Nintendo’s own first party titles that utilize the Wiimote will use MotionPlus. Nintendo Land minigames such as Metroid Blast require the MotionPlus controller for greater accuracy.
The advantages of using MotionPlus are obvious — it provides more specific controls and true 1:1 motion tracking movement, where what players do in real life is perfectly replicated in the game. This was best showcased with the latest Zelda game, Skyward Sword. It’s safe to assume that most third party developers will opt to use the improved motion controls, it would make little sense to stick with older technology. Especially since MotionPlus doesn’t cost developers anything extra. As mentioned before, the Wii U supports both the new and old Wiimote, in addition to many other Wii accessories and peripherals.