There's already some announcements coming out that hint at what things may look like during and after Secret Wars.
Brian Michael Bendis renewed his exclusivity deal with Marvel, and he'll be wrapping up his runs on both All-New X-Men and Uncanny X-Men in May, which is around the beginning of Secret Wars. No word yet on what additional books he may take on in the future, but FF is one of the speculated titles.
May also sees the launch of A-Force, a new Avengers book featuring an all female team (including She-Hulk, Dazzzler, Medusa, and some other characters I don't know) and will be written by G. Willow Wilson and Marguerite K. Bennett.
First A-Force image:
With Bendis and Wilson now moving off ongoing X-Men titles, I'm curious to see which writers and creative talents land on whatever X-books come out during and after Secret Wars.