The story here picks up where Halo 5 left off, and begins when the crew of the Spirit of Fire, a UNSC battleship, suddenly come round from a long period of cryosleep to find themselves floating above an Ark - an infamous, space-station-come-homeworld from Halo lore.
Perhaps the biggest difference is rather than producing individual units, you'll instead produce groups of soldiers - a move that's designed to make it easier to select units without the speed and freedom of a mouse.
While all the basic building blocks are still here - the game's played from an isometric/top-down perspective, there are resources you'll need to gather, and you can build a base and manufacture units - almost everything here has been simplified, in the hope it'll make the game both easier to grasp for novices, and a better fit with the slightly less accurate console controls. Like its predecessor, Halo Wars 2 is a real time strategy game that's been slimmed down for the console audience, in an attempt to make it more accessible. Yeah, that supply pad's not long for this world.