Harmony Gold went apeshit on S&T about the unseens in the MW5 trailer. There's issues with MekTek no longer being considered no-liability for the unseen versions of the Marauder, Warhammer, etc. because they're authorized by S&T to release MW4: Free. Either way, the honchos up at MekTek have said the coding's done. The problem is due to legal concerns.
Their site has gone down today, that may or may not be a sign that they're revamping their site for free release. I don't pretend to know, but it is an omen of something to come.