Character advancement is still lacking in specific details but has been confirmed to not be class-based. Instead it is skill/power-based, letting you mix & match your abilities from hundreds of martial arts, weapon-based and magic choices available to fill the role you want.
Standard MMORPG roles will be achievable for those familiar with them by choosing the right mix of powers. Powers come in Active and Passive and you have seven available slots for each category, giving you up to 14 powers at any one time.
According to recent reports, character gear will be a critical part of advancement as well. Gear can add points to existing powers, saving you from having to invest character development in specific skills if you are able to acquire items that will enhance them enough for you.