Functionality unknown, but SmartGlass integration seems likely.
Halo 4 will launch with support for the Surface tablet, Microsoft exec Don Mattrick confirmed at the GameBeat 2012 conference last night, reports VentureBeat.
Surface will launch once Windows 8 rolls out in October.
It's not knownm how the Surface tablet will be used with Halo 4, but some form of SmartGlass second screen functionality seems likely.
Halo 4 will launch November 6.