Xbox One Preview Program members will get an early shot at checking out another backward compatible title with Halo Wars. According to Xbox's Larry "Major Nelson" Hryb, the classic real-time strategy (RTS) game should become available for Preview Program members to check out shortly:

To recap, Halo Wars was released for the Xbox 360 in 2009 as an RTS title in the Halo universe. In the game, players are tasked with the typical RTS challenges of managing resources and building bases while controlling various vehicles and units in large battles.

While it's unclear when Halo Wars may be available for those outside of the Xbox One Preview Program, Microsoft did just launch a new set of backward compatible titles with Alan Wake, Castlevania: Symphony of the Night and PAC-MAN.