I'd like to see a new Black Cat built on the newer ML Black Widow, which came with the Winter Soldier.
I also wouldn't mind a 6 inch Firestar in either her modern look or her classic costume. Not just because i wanna display her with ML Spidey and Iceman. Though there aren't really a whole lot of the old New Warriors in plastic, except Nova.
There's already plenty of Rogues, but she's had plenty of looks too. The ML Rogue that came with the X-Men boxset is still decent for her 90's look, though i wouldn't have minded it being packed by itself.
I also want a newer Scarlet Witch. In her original look if possible. I think i actually like the one from the old Avengers Reborn line waaaaaay back in the late 90's. The likeness actually looks better IMO.