Colexi's Mom, maybe not yet but eventually Song will indeed replace Delta Express eventually. Our trip is in December, still shows up as scheduled with Delta Express but it very well may be switched to Song by then, flying out of BDL.
I know several flights leaving out of Boston and NY were switched, so keep your eyes open and monitor everything to make sure you keep your requests.
I won't mind flying in such a kewl looking plane with amenities included!