Creative Assembly is certainly a busy team these days; not only is the British studio hard at work on Total War: Warhammer, but at Gamescom yesterday it was announced that it's also handling Halo Wars 2.
This is the sequel to Ensemble Studios' reasonably well-received 2009 Xbox 360 RTS, which was set in the Halo sci-fi universe. You can see the cinematic announcement trailer above, which doesn't reveal very much at all; details of any kind are fairly scarce right now, but we might find out more as Gamescom rolls on.
We do know that the game is set for release on Xbox One and Windows 10 this Fall. If you fancy checking out an actual slice of in-game action, check out CA's rcent battle demo for Total War: Warhammer.