Oh yeah, totally agree, if next expack is indeed Legion centric or even partly about the Legion and has Demons in it, then everything's on the table and it might be a logical part of our flavour changes. For Mists though, I'm not seeing it. Doesn't fit the theme of the expansion, no demons anywhere so far. We might get to see some demons in the Class quest line in 5.2 (if we get it) but I doubt that'd be enough to spark new female versions of our pets + Incubus. So for Mists at least I think it's marginal beyond the normal marginaliness (lol) of new art.