Tomorrow I'll finally be able to watch the new Avatar trailer in good quality. My guess - way back when - was that Lucas would attach a teaser for 3D Star Wars to Avatar when it hits in December. Yeah, looks like that ain't gonna happen (I mean, we would've heard it by now, right?).
All of his talk about it has probably only been that - talk. Obviously they converted a few scenes from ANH but that's just a few scenes. For all we know, that's all they ever did.