Yes. Now that Bitstamp is enabling ETH trading, it makes total sense that a next step would be enabling ETH tokens trading on Bitstamp,
And since Quantum Project is a Market Maker for Bitstamp it makes sense that QAU will be traded on Bitstamp. Just like QAU is traded on Gatehub.
http://blog.gatehub.net/post/161749683192/gatehub-enters-into-partnership-with-quantum