Pretty that next successor class uses gunslashes as main weapons.
I forgot which video it is, but it's short and either on bumped or on the official PSO2 youtube channel (and quite recent, no date or anything announced yet).

At first I thought about sabers and handguns and then it finally clicked, obviously this guy is using a gunslash.
Looks really cool and I'm glad there will finally be a gunslash main class.
Gonna be awkward if that class can use only a single weapon though >_<