In total, there are more than a million different combinations to be made in conjunction with a character's customizable aesthetics, which include the ability to choose your race, outfit, insignia, and plenty more.
Other cool features planned for the final release include leaderboards and player stats, new weapons like the tri-shot pistol, orbital strike, and carbonite freeze gun, and a unique single-player mode that boasts eight ground and three space maps. The best news of all, though, is that Renegade Squadron handles a whole lot better than the PSP version of Battlefront 2 did. It's much easier to target now and characters run around the screen at a much better clip. Granted, there are some weird collision issues going on with structures (it is sometimes hard to discern where a wall ends and another begins), but development is still early and the plan is to have most of the tech issues fixed up by release.
Further details at IGN.