A major part of Wii U is backwards compatibility, not just with games but more so with controllers and accessories. The asymmetrical multiplayer that's so important to the system relies on one player with a GamePad and others using alternative controllers, such as Wii Remotes and Nunchuks. The Wii U console bundles won't include any Wii controllers, which shouldn't be a problem for many people, but for those that haven't owned a Wii or won't have any controllers, Nintendo of Europe has an answer.
During his Nintendo Direct broadcast Nintendo of Europe President, Satoru Shibata, confirmed that a Wii U accessory pack will be made available called Wii Remote Plus Additional Set. It'll include a Wii Remote Plus controller, a Nunchuk and a sensor bar, the latter of which isn't included with the basic white Wii U bundle but is with the black Premium option.
A glut of other Wii U-range accessories were also confirmed, including individual Wii Remotes in an extensive range of colours, Nunchuks and what looked like a spare GamePad stylus set. We assume similar packages will be confirmed in North America and other regions as well, and we'll keep an eye out for details.