I've been saying it for as many years as I have known the 40k Universe. There needs to be a straight up large-scale(I'm talking planet-side scale) Battlefield 40K. There are few other IP's out there that have as much depth fleshed out as the 40K franchise, and with the expansive myriad of weapons, vehicles, hero's, psychic abilities, and just every god damn thing in the 40K universe, they could easily make the game that towers over all others. There is very little any other science fiction universe has done that 40K didn't already do, and better. Like its been mentioned, massive battles that pit hundreds of marines alongside thousands of guardsmen, up against thousands of orks and shifting masses of tyranids would be experiences like very few others(and i say that just as a disclaimer, nothing else has come close.) Add in any of the other races, such as my favorites the tau and the necrons, and you cannot go wrong. A team oriented class based 1st person shooting/3rd person melee combat extravaganza, flavored with a gallon of the most bad-ass vehicles to ever be thought out, and I don't see how a triple-A developer cant turn it into a franchise destroying juggernaut of gaming nirvana. My only thought is that they haven't fully grasped around the pure awesome that it could be.