I honestly can't see them saving such a huge change for a patch when it could have easily been included in the box version. Seems more like a bug which resulted from them patching the add a trait feature. Add to it half a dozen people who act as if they know it was an intentional change and suddenly this bug has legs. I have reread the changelog several times and have yet to see anything mentioning a new "exp gaining system" so I'd lay money on it not being WAD. I just wish a dev would show up and confirm it one way or the other.