Nintendo will be bringing a white version of the Wii U Deluxe bundle to Japan this July. In addition, the company will be releasing an improved battery pack for the GamePad, which will boost its life from 3-5 hours to 5-8 hours.
This improved battery option will be headed to the territory on July 25th, with the white Wii U bundle coming a bit earlier on July 13th. Sadly, there's no word yet on whether or not either will come to the West, but it is hard to imagine Nintendo not bringing this stuff to North America and beyond at some point in the future.
Last (and probably least) is a Quick Charge Set for your Wiimote controllers. This too will be available in Japan on July 13th and will finally provide gamers with a charging dock and battery pack option that isn't some cheap third-party knockoff.
We'll be sure to let you know if any of this get confirmed for a Western release.