Soon there is going to be a digital comic that ties into the Man of Steel Film and the preview has got some very interesting stuff in it..including what appears to be the story of Kara Zor-El's journey to Earth in the Man of Steel Universe. My guess is that Kara Zor-El is going to appear in Man of Steel 2..
Per DC Comics:
When you preorder the Blu-Ray Combo Pack or DVD of Man of Steel (PG-13), you'll not only be the first to own the film, but you'll get a free bonus digital comic book written by David Goyer; the writer of Man of Steel and the Dark Knight trilogy of films. You'll also get a free download of three Superman animated episodes (see store for details)
Visit http://www.walmart.com/manofsteel to find a theater near you that is participating in this exclusive engagement.