@conniption_fit: I think you hit the nail on the head here. Theres been rumors of Marvel's Cinematic Universe possibly going the inhuman route to introduce some characters that would otherwise be classified as mutants, or unexplained powers. Once they have an inhuman virus in the MCU (like an air born terrigen mist) its easy enough to introduce new characters into the films without having to explain back story and power origin. Obviously this would only really work on c-level characters since it would behoove marvel to introduce new fans to a characters back story to get them invested, but for the sake of saving time and filling in the world a little this could work.
Major Spoiler for Captain America The Winter Soldier (seriously, don't read if you haven't seen the movie or care at all about being surprised:
I think this is what they're setting up at the end of the film having Baron Von Strucker experiment with the power source in Loki's staff, which we know derives from the cosmic cube (tesseract). When we meet the Scarlet Witch and Quicksilver, we're told they're the products of the experiment with the power of the staff and its easy enough to believe that when they eventually escape (or released depending on how the story unfolds) they could be the catalyst for an eventual widespread empowering of the MCU. With Scarlet Witch and Quicksilver being a part of both the Avengers franchise and X-Men, whose to say we won't see other 616 mutants that were at one point on the Avengers also make their way to the film as tesseract powered individuals (this could be the reason behind the increased fusion of Avengers and Mutants in the comics lately). This could lead to us seeing MCU versions of Beast, wolverine, cannonball, rogue etc in the semi near future.