Teh Sexy Monkey Queen
It was confirmed that Fraction does have something else in the works at Marvel; it's just not being announced yet.That kind of makes me think maybe there aren't any. Like maybe he just told them that he would work on stuff without having anything specific lined up and with no real urgency in setting something up.
It makes sense. Sex Criminals was just named the best book of the year by Time (I think). It might be the encouragement he hoped for to do more of his own stuff.