Bendis said "not everyone is walking out of AvX alive"... I'm going to go out on a limb and say that the young X-Men are replacing their dead older selves. That's the only way that they can have them sticking around in the current Marvel universe, otherwise it would just get kinda lame with "It's Cyclops... and Old Cyclops!" etc.
We've already seen an image of "Present" Cyclops alive in that Marvel Now promo image. In that silly red suit.