Well, going by the list of waves two and three, and given Hasbro's penchant to the three "R"s these days, this is my honest opinion of what we will probably end up getting in terms of new vs. rehash, articulation, etc:
REBEL SENTRY HONOR GUARD: I assume these are the guys to either side of the door when Han and Luke enter the Throne Room at the end. The body will probably be Captain Antilles from the waist down, with resculpted torso and arms (cut socket joints and wrist joints), a balljointed head, and a new helmet. He'll also include a Rebel blaster that won't fit in the holster and a repaint of Sun Fac's staff.
HAN SOLO: VOTC version with new upper torso and a medal
LUKE SKYWALKER: New sculpt with horrible soft goods coat (ala Princess Leia collection in 1998, but better), but no knee or ankle articulation. Will come with medal, lightsaber, and blaster.
DEATH STAR TROOPER: Either the 2006 Death Star Gunner with a new head and helmet, or the 2002/2003 Imperial Officer with a new head and helmet. If it is a totally all-new sculpt, I'd be shocked.
BIGGS DARKLIGHTER: If there are really going to be two Biggs figures next year, this one will be the lesser of the two, and will probably be the Dutch body with a new head and removable helmet, or (if they're being nice) the VTSC Luke Pilot with a new head and removable helmet.
CANTINA GUYS: These will be all-new sculpts, unless there's some way they can recycle some of the post-OTC Cantina trio's bodies' parts for the new characters. And knowing Hasbro, they probably can and will.
DARTH VADER: It'll either be the 500th Vader (again) or the one that's coming out in the Commemorative Tin with the ANH chestplate and removable helmet. In other words, a complete rehash.
BIGGS: If this is the Anchorhead Biggs, I would imagine it's a totally new sculpt.
LUKE: Probably the 2006 TSC Tatooine Luke rereleased with some new accessory that will be interesting enough to warrant people buying it (Moisture Vaporator, perhaps? Hasbro did say at one point that one was coming in 2007...)
JAWA AND LIN DROID: The Jawa will probably be the CommTech version (which, all kidding aside, is one of the only POTF2 figures that IMO works with the newer molds) and the LIN Droid (whatever that is; I'm assuming it's one of the Sandcrawler Droids we haven't gotten yet) is a new sculpt.
STORMTROOPER: This had BETTER be the VOTC Stormtrooper, totally white with no battle damage. There is no excuse for them to release a Sandtrooper with that body sculpt, an EU Trooper using that body, and then wind up rereleasing the CommTech version again. Hasbro knows people want the VOTC Stormtrooper, and if they packed it at 2 per case in every assortment for the year it would STILL outsell a lot of the "new" figures. If you're going to rehash something, rehash something good that people will buy, not Mace the Grape Ape or Twist and Shout Obi-Wan from the ROTS line.
I really hope I'm wrong with the amount of rehashing I'm dreading above, especially with the first wave of ROTS stuff being so cool looking and almost completely new molds being used. But, if this year has taught me anything (and if the Vader with Coin Book being the 500th figure yet again is any indication), it's that Hasbro will rehash as much as they can as often as they can.