The Missing Link DLC, which the Square Enix studio says are integrated into the Director's Cut narrative.
Today's announcement reveals the Director's Cut employs a selection of GamePad features, such as "touchscreen hacking, interactive map editing, augmented sniping, grenade throwbacks, and many other neural hub enhancements." Eidos Montreal also says the Wii U version brings improvements to the game's boss fights, balance, combat, AI, and visuals, along with developer commentaries, in-game guides, and Miiverse integration.
DX:HR Director's Cut was leaked by Amazon yesterday, which listed the game's release date in the United States as May 7. While today's announcement comes via Eidos Montreal, the developer isn't yet specified. Australian studio Straight Right is reportedly bringing a major Square Enix game to the Wii U, so it may well be involved.
Update: According to a piece on Eurogamer, Straight Right – the same studio who ported Mass Effect 3 over to the Wii U – is co-developing this along with Eidos Montreal. Some more information is also provided about the retooled boss fights, which players can now overcome without having to fire a single bullet – alternate strategies and such will be put in place to offer players variety beyond direct conflict in Deus Ex: Human Revolution's three boss battles.