Re: Bryan Singer Directing X-Men: Days of Future Past - Part 3
I think they haven't announce Halle Berry, James Marsden, Famke Janssen, Lucas Till etc because either they're not in DOFP or they are just minor roles.
Normally, they will announce those key central roles first. The supporting minor roles will be announced last.
They don't have to bring everybody back. The cast will be very crowded.