I really doubt that the next wave of Greedo/GI/Obi will be available before the North American champs at Gen Con, but it would be interesting to be wrong.
Also, I would think that they would leave it out of the tournament if it was available there (for the first time)…
I think they want them before GenCon. And it wouldn't be the first time FFG or any company added new content a week or two before a big event. I actually prefer this, as it brings an unexpected side of the game to the large events.
~D