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The Rend site has been published that reveals the four character classes coming with the game: Assassin, Soldier, Survivalist and Mystic. What makes Rend different than other ARPGs / survival games is that class isn't chosen at creation, but comes at level two. In addition, players will be able to choose one of the remaining three classes as a secondary. Each point applied in a path, unlocks different tiers of abilities.
Comments
I'm guessing that ties into the faction system, you may not know your faction members, but you are effectively in the same guild. Choosing after joining the game gives you the option to see or ask what everyone is playing. Right at the start no-one would be set yet, so if you care about the number of classes played you'd have to ask what people are going for.