A given character in Skyforge can explore all of the game’s classes, and advancing in one class helps bolster progress in other classes as well. So there’s really no upward limit on how many classes could be included with the game’s launch, and the developers have stated outright that more classes will be added post-launch. But there will be 13 classes in the game at launch, and those 13 can now be browsed on the official site.
Of the 13 classes on display, two serve as tanks, two as support, and nine as some form of damage-dealing class. Some classes are already familiar from previews and beta tests, such as the Lightbringer, Gunner, and Paladin; others, like the Knight and the Witch, are heretofore unseen. While you don’t have to feel locked into any one class, it wouldn’t hurt to take a gander at the official reveal and gauge which class you want to work toward first.
[Thanks to Brian for the tip!]