Renaming the current stuff would be lame. How would changing pugilist to monk really work out? The guild is a bunch of gamblers and ruffians that like punching stuff. Monk would imply some kind of focused martial artist setup. Pugilist is a brawler. We have an attack called haymaker, and pummel.

However, throwing in some advanced classes with conditionals to unlock them (specific level in a specific class) would be great.

I'd like to see Samurai, Paladins, Dragoons (lancer special class!), Dark Knights (Marauder special class!), and stuff get added in.....

but it will definitely require some effort to get them. If you could just toss a new weapon on and instantly be a samurai, that would realllllly cheapen the whole addition of new classes.