Yesterday, in a post on the official forums, SWTOR Lead Combat Designer Georg Zoeller answered this burning question. He confirmed that we will be able to respec our stats within an Advanced Class. However, he had this to say about switching to a different Advanced Class: "You may be able to spec to another Advanced Class, but that is something we haven't entirely made up our mind about as there are plenty of arguments that can be made - pro and con - and future class developments could influence this." It may be possible to change from a Jedi
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