Lucas didn't retcon previous Wookiee Jedi out of existence, he just deemed that there weren't to be any more. And given Filoni's unique access to Lucas as a resource, I don't know if the floodgates are opened for more Wookiee Jedi or if the EU is still restricted. Though we're talking about a guy that four years ago was insisting that there definitely would not be a sequel trilogy since the story was concluded and there was nothing else to tell0, and that he left instructions that there were not to be any more films. Now he's saying the exact opposite. That the ST and not the OT will serve as the conclusion (don't know what's left to conclude unless the Sith come back or the Force is still unbalanced, the Empire gets a new heir to take Palpatine's place, etc.) He's also said that he's fine with there being movies after he's out of the picture... So I wouldn't put it past him to just have completely changed his mind when it comes to Wookiee Jedi too.