Skimming through the Database, I came across a couple class costumes that were tied with a handful of unannounced classes. These include:
Dragoon: http://www.tosbase.com/database/items/620115/
Panzer: http://www.tosbase.com/database/items/620113/
Musketeer: http://www.tosbase.com/database/items/622114/
They share the sprites with other, already announced costumes in their class tree, so I’m guessing these are just placeholders. As far as what they’ll be like, my guess is Dragoon is a spear class, Musketeer is a 2h gun class (if not that, then 1h), and Panzer…I have no idea