I'ld like to see Magneto working with Charles, oweing him for saving Quicksilver, so Quicksilver and Scarlet Witch are like allies with the team, in a way, before they quit, and ditch their father.
Also, seeing Jean fight a sentinel would be cool, slightly using Phoenix abilities, but is not noticed by the team, and i'd also like Shadowking, since Storm would be in. also, the Sentinels would be early models, so they wouldn't be as powerfull as they seem in X3's Danger Room session.
Seeing Emma in the team would be cool, and her either dieing (she wouldn't mind it, as she'd be with her sis
) or leaving at the end, and also Gambit helping out a little.
So bassically, the team would be: Scott, Emma, Jean, Hank, Storm.
The villains would be: Shadowking and shadow creatures, Sentinels & Mastermold, and a fight with Magneto.
The X-Men's allies would be: Gambit, Magneto, Wanda and Pietro.