What if you do want to change to a new class but don’t want to level up all over again? The newly added class change feature is just what you asked form, then, allowing you to hop to another class while retaining your level. There’s also a new motorbike mount to unlock through questing; you can see a preview of the bike along with the Assassin class in the trailer down below, or peek at the screenshots for a glimpse of the new training areas.
Source: My.com press release