heads is released on a when-ready basis, meaning when things are ready and relatively stable, you can expect a new release of heads. You are always advised to use the latest version since it probably contains bugfixes and more features than the previous versions. In case of emergencies and/or vulnerabilities, a patch release can be made and will be announced.
All releases and their SHA256 sums are signed with my gpg key:
0333 7671 FDE7 5BB6 A85E C91F B876 CB44 FA1B 0274