As for the BioWare and the Space Marine thing: Officially speaking there are now only three BioWare studios left (Edmonton, Montreal and Austin....the former studios under the Bioware umbrella have resumed with their old names), and we do know that Montreal is busy with Mass Effect Next while Edmonton works on Dragon Age 3 and a new IP (confirmed several times). Austin I think is just keeping TOR alive, so I don't really know where they'd put a 40K game into their schedule? Perhaps after the DA3 team is finished, but there I hoped they'd then go on with a Jade Empire sequel.
Well, time shall tell. But certainly BioWare acquiring the license is not a thing out of this world as quite frankly, after learning that Gearbox acquired the Homeworld license, that was much more of a shocker than anybody could have absorbed.