I strongly believe we will have more evolutions of some older Pokemon based on gender i.e. a male Farfetch'd evolves into a big duck beast and a female Farfetch'd evolves into a... I dunno... Swan thing? Not specifically like this, so I hope I am getting my idea across still. LOL
I'm really hoping for a Quagsire and Banette evo, myself. Quagsire especially, not only for being my favorite Pokemon but because it's seriously an inch away from becoming very usable in battle. Unaware is too good.