My predictions...

Marauder 30 | Thaumaturge 15 : Dark Knight
Gladiator 30 | Lancer 15 : Samurai
Archer 30 | Musketeer 15 : Ranger
Conjuror 30 | Thaumaturge 15 : Red Mage
Thaumaturge 30 | Arcanist 15 : Time Mage
Lancer 30 | Gladiator 15 : Templar (Tank, Spear + Shield)
Pugilist 30 | Rogue/Flayer 15 : Dancer or Berserker
Rogue 30 | Pugilist 15 : Theif
Rogue 30 | Flayer 15 : Ninja
Musketeer 30 | Flayer 15 : Corsair
Musketeer 30 | Thaumaturge 15 : Gun Mage
Flayer 30 | Lancer 15 : Beastmaster
Flayer 30 | Rogue 15 : Puppetmaster
Mystic 30 | Conjuror 15 : Green Mage
Mystic 30 | All Classes 15 : Blue Mage

New Classes

Musketeer (Pistols)
Rogue (Dual Daggers)
Mystic (Staves)
Flayer (Whips)