Is there something we can subscribe to, so we can understand when the new version is released?
hmmm, maybe you can get notifications about updates (or version tags) at github.com/goatpig/bitcoinarmory (you'd need to sign up to github I guess)
really, you're already asking in the right place, goatpig is the main dev for Armory, and this sub is where all the public discourse about Armory happens.