I think DA Chucky's right. This is one thing they will likely keep from EVE. If I were you guys, expect that a respec will not be available. the only way to correct a mistake is through time.
Edit: Wanted to clarify.
The reason why Eve is like it is. If you make a mistake, it's not really a mistake. It's a "Delay"
Unlike most FPS's, you will not be limited to the number of skill points. If you stay around long enough, you will eventually be able to specialize in everything that Dust has to offer.
For example: Lets say you decide to go a tank role. Halfway through the process, you think that "this is a stupid idea". Well you've lost time, but now you can reschedule your training to go for sniper/medic. After you have skilled up that you decide you want to do tanks again. Guess what, your still half-way! You don't have to respec and lose sniper or medic. Once you have a skill. It's yours...
**Unless they put something in, similar to Eve where you can lose those SP's hehe