They might not introduce Madelyne Prior in X3 - considering the fact that she must be a look-a-like to Jean Grey in X-Men and X2, which is somehow, impossible as of now.
The reason maybe for Phoenix to turn Dark could be the "flirting" of this White Queen to Mr. Scottie, what you think? 🙄
Cyclops and Emma Frost, anyway, are Weddon's precious characters in his Astonishing X-Men... so POSSIBLE. 😄