New characters in Prime will begin the game with five basic skills, though they'll gain access to newer and more class-specific abilities as they progress. Each class will ultimately end up with a total of 15 skills. Progression is skill-based, with players earning skillpoints as they level. These skillpoints can be allocated amongst the character's various skills as they so desire (though Pitchblack did point out that it will not be possible to max out every ability with the amount of skillpoints granted, which will force players to prioritize).
Another point to note is that Prime will not be permanently tying players to a given build. Pitchblack President Warren Weems says, "We don't think players should be permanently tied to choices they made when they were still learning about the game. We also want people to feel free to experiment." As a result, skillpoints will be "relatively easy" to reallocate if players feel the need for a change of pace. For more information, and for the full class and ability listings, warp on over to the official site!