The Scarlet Witch - Wanda Maximoff - is a featured character in Avengers vs X-Men# 0, the prequel to the main event. It is also a sequel to Avengers # 24.1 (a surprisingly downbeat story about The Vision, who is also back). How does anyone manage to follow this stuff? Oh well, here I am following some of it for you.
Later on, The Vision - Wanda's android husband, who has recently been put back together from destruction via some help from Iron Man plus his self-repair mechanisms then kicking in - is not too happy with his wife for destroying him (some years back in our time, but not so long ago in his). He boots her out of his artificial life, and out of any opportunity, for the moment, of rejoining the Avengers. A bit complicated, with all the convoluted, soap-opera-y back story that has to be conveyed, but fun enough in a kind of emo way.
I guess next time I can report in on what happens in Avengers vs X-men #1.