Well, considering what's currently on shelves (or what will be in the Saga Legends collection at around the same time these will probably hit), this is what the set should include, IMO, to make it worth a crap:
-ROTS Pilot Obi-Wan repainted in AOTC colors with new head
-ROTS Evolutions ROTS Anakin Skywalker with Sith Eyes
-ROTJ Evolutions Emperor Palpatine/Darth Sidious with new head
-ROTS-era Asaaj Ventress (from first Jedi vs. Sith Battle Pack)
-Saga 2003 Coleman Trebor (complete with base) OR Post-OTC 2005 Pablo Jill
Do they fit together in a scene? Are they logically placed? Nope. But it's better than this, which is what we'll likely end up getting:
-ROTS Mace Windu (again)
-ROTS Emperor Palpatine (again)
-TPM Darth Maul (Jedi Duel)
-ROTS Obi-Wan Kenobi (Jedi Kick)
-ROTS Anakin Skywalker (Mustafar)