....information on the last episodes of The Clone Wars has come in. Looks like the Sith origin world is NOT Korriban, but a world called Moriband. The descriptions are just like Korriban so it seems like an FU to fans, imo.
If you want some semi-spoliers on the descriptions of the episodes head here http://jedinews.co.uk/default.aspx
You'll need to scroll down but it's all there.