I would like to see the end game armor sets from vanilla return to the game. (Tionese, Columi, Rakata) Because these sets actually looked good (at least the Jedi Knight ones), unlike the sets they've created now...
I was really sad to see these dissapeared for no apparent reason as I was busy equipping my companions with them and now they're running around with half finished gear sets... And they looked good...
Either in-game or through the Cartel Market. I would definitely buy them.
Also, headgear for the various adaptive sets, like they did with the Eradicator set.