We post to the dev and user list when we release a new version, so you could subscribe to one of those although you would of course also receive other emails. We also announce it on the forums, in IRC and on the website, but they won't contact you. We have a google calendar you can subscribe to where we list the planned dates, but we don't always manage to stick to them
It can be found at https://email@example.com
Other than that I don't think we have a dedicated channel for announcing releases.
H140, F60, S120, e260, c240, Clip, Fuze v2, Connect, MP170, Meizu M3, Nano 1G, Android