Texture wise I and a few others have it planned, it just depends to when we get around to it! Hopefully in the first half of next year, but I can't promise anything right now.
Model wise, unless someone finishes a .mgn exporter, no chance for now.
There are actually a bunch of hairstyles in the client files that were never really used. Sullustans for example have some badass hairstyles in the client, but they were never actually given hair, with the exception of a few NPCs.
It'd be nice to get them working at some point since we're still waiting for an MGN exporter anyway. Obviously there's some server side work to be done for that though.