A starfighter I would like to suggest as a future expansion is the Delta-7 Aethersprite-class light interceptor, also known as the Jedi Starfighter.
http://starwars.wikia.com/wiki/Delta-7_Aethersprite-class_light_interceptor
The fighter first appeared in Star Wars Episode II: Attack of the Clones piloted by Obi-Wan Kenobi which he used to pursue Jango Fett with to Geonosis.
During the Galactic Civil War which the X-Wing Miniatures Game is set, Obi-Wan's Jedi Starfighter was later found by Wedge Antilles after crash landing on the planet and then piloted by him. He used it to destroy Imperial Forces in space before finding the ship's hyperdrive ring and presumably piloting it back to the Rebel Alliance.
Edit: Just to clarify, I'm not suggesting for a Clone Wars era expansion, just for the Delta-7 possibly as a Rebel Alliance expansion.
Edited by Vector