I think the reason the Sandtrooper is included is that it is one of those figures/characters that everyone sort of thought should have been seen in the original vintage line (along with others like Stormtrooper Han, Tarkin, Rebel Fleet Trooper, Slave Leia, etc.). I wouldn't be surprised to see some of those recarded as well. Personally, I don't really mind seeing that either - for the most part. It looks like a lot of these waves will be upgrades and repacks, so as long as they use the true "best of the best" and don't start sticking older POTF2/POTJ/EPI/SAGA figures on these cards, I think it would be alright. It does seem like they are going to hope the appeal of the "vintage cardback" will push the sales of a lot of these, because we have seen a lot of them not only recently (Cody), but often (Sandtrooper).
As for the ROTS wave, it looks like we're getting another wave of upgrades and repacks for the most part. It will be interesting to see what is a resculpt and what isn't if this is what the wave really is. From the pic we've seen, it looks like Grievous is just a repack with a new cape. You would think Cody is a repack since he was just re-done. I could see Anakin being a re-do, as Hasbro has stated in the past that he wasn't quite perfect. Sidious is likely all new, as with the Magna Guard (we hope anyways). Obi-Wan I would think is a repack, since the Pilot version is pretty much perfect for most I think. I'm not sure what else they could do with the Clonetroopers, aside from improve articulation (hips) or something. I'm pretty happy with them the way they are now. A little disappointed to not see at least one all-new, never before made figure (like Merumeru as an example), but it could still make for a nice wave.