Noel's fight against Rachel is in Kagutsuchi Port AM from CT. There, CT/CS stages are indeed in the game for all the people who would complain about their removal.
"Sword of Hades" was actually used in CS True End post credits scene, there it was read as "Izanami no Tsurugi" by Hazama in Japanese (Izanami even showed up in furigana), but the English dub said "Sword of the Imperator". Before calls of off-topic, just explaining what it means since it showed up in translations of Nu's profile in THIS thread. No need for further discussion on it in the story thread, because there is nothing further to discuss about it.
Oh, and yeah the article calls Mu and Nu "time release characters" (I.E. time-locked). They will not be playable day 1.