My best hope is that Mystique just gets used as something other than the cackling sociopath. The character used to have a lot more depth to her with her mixed motivations. Though yeah, the X-Men out in the Marvel U is a plus, imo.
I'm not entirely sure I want a redeemed Mystique, as I think the X-Men have a shortage of compelling villains since Mags and Emma crossed to the other side. What I'd like to see is more of her ambiguous loyalties explored. It was done to good effect with Rogue and some really solid ground work was done for she and Kurt to be explored at some future point. It would be great to see that followed up on.