bought some nxt from poloniex, did i get free ardor on October 12th without need to transfer my coins to nxt wallet.
Seem like you can keep your NXT on Poloniex (but it's always more secure to hodl them on your own wallet).
http://www.econotimes.com/Poloniex-BTC38-and-Bittrex-agree-to-distribute-Ardor-tokens-to-customers-232665
Very nice. Very comfortable way