I said never mentioned in KotoR, not never mentioned ever. If you read my post, you'll see I mention the Chiss and Vagaari, both of which have been featured previously. If you were running into Chiss and Vagaari, you'd probably be somewhere in the vicinity of Csilla.
However, I'd prefer most of the worlds to be ones that have never been featured before. Especially if Obsidian is designing it. Then maybe they can put their creative juices to good use instead of just pretentiousness.