We know about race and classes. But on an article their was something called builds. "...something we've not yet talked about, builds..." Was the exact quote.
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I was under the assumption that it was the the way your character is customized. And I think my assumption is correct. But I think what you may have come across is another addition to how we can customize our characters. I think you may have stumbled upon something that may not have been discussed. I guess we will see. We really don't have much longer to wait