This has been touched upon in other forums, but not in a topic of it's own.  I'm surprised at the fairly quiet response it's received so far.

Following on from the Age of X, it transpired that he being known as Revenant was in fact the consciousness of Rachel Summers who had been trying to telepathically reach someone back on Utopia at the moment that 'Moira'/X struck.  In an effort to reunite Rachel's disembodied psyche with her body, we're finally going to see the return of the three missing X-Men: Havok, Polaris & Marvel Girl.

The three space displaced X-Men have been mising for years, with the occasional appearance during cosmic cross-overs.  However, fans have been demanding their return ever since they were stranded in space, and it looks like Marvel has finally decided to respond.

How will they be saved?  Where are they at the moment?  How will they react to a relatively quiet existence back on Earth?  Will they make it back to Earth?  Will Magneto & Polaris be able to co-exist with the knowledge that Magneto chose to save Kitty Pryde, but not bother searching for his own daughter?  Will they remain with Rogue's new ensembled team?  Will Havok & Polaris remain a couple... or will he fall for another PiS-created stripper/nurse?

We don't know the exact details yet, but here's a popular taster that's been flying around the internet: