Nintendo Direct, Big N president Reggie Fils-aime announced a special partnership with Best Buy. During the week of E3, the big box electronics store will be hosting playable demos of unreleased Wii U games. Presumably, these will be the games that Nintendo is showing off during the industry's annual trade show, but Fils-aime did not reveal specific titles.
The week of E3, incidentally, begins June 9. Your friendly Joystiq staff will probably be too busy to make it to Best Buy though.