Actually....
Putting WH40k's looks into an X-com enemy within engine and ruleset could be amazing. There's enough basic variety there and... ok, they already have tactical, heavy and assault if you base it off a space marine background but... I could play more of that sort of game quite happily. Throw some lush looking 40K at it and that would make a tidy sum for most publishers.
Kinda like Chaos Gate? The turn based 40K game from years back.