Alll I really want is my Fencer > Red Mage, but I could see a couple others.

Breeder/Tamer > Beast Master

Oracle > Summoner

Mercenary > Dark Knight

Rouge > Thief

Genin > Ninja

I am very curious as to weather or not we will eventually get those Gun Blades as playable weapons. Not sure what that class would be called... Gunbladier? or would it just be a Gladiator/Fencer with a Gun Blade?