I want a Psychic job in the new expansion more than life. I know everyone is going nuts for a blue mage but I don't think FF14 needs to integrate all the colors of the rainbow into their casters. I think a Dancer would make the majority of players happy.
But something I never see mentioned - Psychic!
It was one of my favorite classes to play in FFX2 and pretty much in all of FF games. Having telekinesis and telepathy as base powers could be so cool and offers so many creative ways to be integrated into FF14.
Just had to make sure I suggested it in a post somewhere.