I think a second wave, or some kind of secondary release (two packs, multipacks, etc) is almost guaranteed. As others have said, Magneto, Rogue, Cyclops and Sabretooth are probably definite choices. Sabretooth *could* be a BAF, I could see them going either way on that. It's also possible that the AoA Apocalypse shown at Toyfair could be a BAF for that wave, rather than a stand-alone deluxe release. I'd expect them to want to balance the wave with a villain or two, in which case I think Sinister is a likely candidate. Any others are probably wild cards, though I imagine they'd want to go for characters that are very visually distinct and/or recognizable to casual buyers. Abyss would be a cool choice, though I don't think he necessarily needs to be a BAF given his standard size/frame. AoA Colossus would also make a cool BAF.