This may not be the best place for this, but I'm not sure exactly where it would go.
Following the inevitable die-off of the ROTS line later this year or early next year, Hasbro is going to have to recognize that we, the collectors, will be their core buyers for the duration of the license. So we should (ideally) be seeing a lot more figures for characters with a split second of screen time, Expanded Universe figures, etc.
But unless every single boring background human is going to be made, at some point Hasbro could conceivably make "off-camera" figures: characters whose scenes did not appear in the final cuts of the films (or that were eliminated in some later revision). Or maybe resculpts of existing characters in off-screen moments?
Would you be interested in seeing figures from the cut scenes? (Keep in mind we've already got four: Jedi Temple Analysis Droids, TPM R2-D2 with Booster Rockets, two versions of Anakin Skywalker (Sebastian Shaw), and Floppy Hat Luke.)
Here's a brief list of some I can think of off-hand, but this is by no means an exhaustive list:
Biggs Darklighter (Academy Uniform)
Heater (AKA "Jabba")
Luke Skywalker (Snowspeeder Pilot Gear) w/ Cannon
Luke Skywalker (Sandstorm)
Leia Organa (Sandstorm)
Han Solo (Sandstorm)
Lando Calrissian (Sandstorm)
Greedo (the Elder)
Padme's family (drawing blank on their names)