Hmm as much as I want to see Apocalypse, I think they should do a build-up movie for him first, before appearing full-time. Kinda like what Marvel is doing with Thanos and what Sony is doing with the Green Goblin.
X-MEN: DAYS OF FUTURE PAST
The future of X-Men's original trilogy cast begins this May!
Hugh Jackman - Halle Berry - Ian McKellen - Patrick Stewart
Anna Paquin - Shawn Ashmore - Daniel Cudmore - Ellen Page