I can't begin to say how excited I am for the OG X-men team to be developed on screen.
With their powers and anxieties it's one of the best dynamics ever. Iceman is my favorite X-man and one of the few times I've seen him really hit his full potential is in Uncanny X-Force returning to the Age of Apocalypse and he turns out to be a turn coat.
Starting with the original five and not pumping in the most popular characters shows to me that the MCU knows that they're the future and building them up the way the comics did is the right move.