I'd rather than the Warhawk developers be working on a new game (sequel) than figuring out how to support Home. But maybe Warhawk didn't sell enough to greenlight a new project from them.
I don't think there'd be a sequel to Warhawk: it'd be like a sequel to an MMO. On a game like that, you really don't want to split your userbase. Expansions, at least, have an especially-friendly price-tag.