As many of you have noted Lucas' possible cameo role in the AOTC senate scene, DarkKnight1138 alerts us to a few frames in the Clone War trailer where you can see the mysterious figure in question. It's at 1min 22secs into the trailer, which we've screengrabbed here.
It looks to be George but it's inconclusive. Looks like we'll have to get word from Lucas for the final verdict.