Well, we have the Hundred-Year Darkness as the origin of the Sith. We have Korriban (yes, Korriban; Moraband is simply an alternative name) and the Valley of the Dark Lords. We have Ziost. We have Malachor. We have ancient Sith mummies, ancient Sith swords, Sith holocrons, Sith spirits, Tuk'ata, Terentateks, Sith alchemy, Sith Empires, Sith wars. Now, thanks to the TROS Visual Dictionary, we have (by name only) Revan, Andeddu, Tenebrous, Desolous, Phobos, Sadow. We have elements of Dark Empire in TROS, and a Sith sect post-ROTJ in the form of the Sith Eternal (which appears to be the New Canon's equivalent to the New Sith Order). Overall, I'm very happy with what the New Canon has done with the Sith.