Prevos and Evos you'd like to see in Black and White.

You want a more womanly Pokemon than Gardevoir?

Ironically, yes. Gardevoir has a feminine look, but it's unisex so male Kirlias aren't left out. But in 4th Generation, Gallade appeared as Kirlia's male only evolution, so that's why Kirlia needs a female only evolution to make it even.

Edit:

 Connecting Cubone to Kangaskhan

Seriously, that would be pointless if it were to happen.