I am sort of getting psyched to see X-First Class. The very idea of an X-Men film set in the 1960's gives me fanboy giggles. Seeing Professor X, Magneto, Mystique and The Beast as younger characters is fascinating, as is the inclusion of such characters as Belasco (I am assuming that's who the red devil guy is supposed to be), Havok, Banshee, Emma Frost and Sebastian Shaw.
I envision that if this film is successful it can become it's own sub-franchise. Carrying the story into the 70's, 80's and 90's before catching up with main continuity. And the plethora of untapped X-Men characters and stories leaves a lot of ground to cover. Maybe they could bring in such great unused characters as X-23, Dazzler, Psylocke, Boomer, Mirage, Magik, Mister Sinister and Mimic.