User blog comment:ADour/Marvel's next event is-- SECRET WARS!/@comment-2204174-20141014201830/@comment-4651179-20141014212759

It will probably have something to do with it. It's written by Hickman, and Marvel said this story has been on the works since 2012.

Regarding Civil War, I don't remember Marvel doing anything apart from showing that poster by Adi Granov. That's the only thing they've done with this mysterious Civil War announcement.