- Copr project "runtime" dependencies were implemented.  Newly you can
  specify set of repositories your project depends on. Such repositories
  will be installed together with the copr project repo file (e.g., by
  'dnf copr enable YOU/YOUR_PROEJCT').  Those repositories can be other
  project in Copr or some 3rd party repository.  This is very similar to
  build-time dependencies implemented long time ago.  Take a look at
  blog post:

    https://fedora-copr.github.io/posts/runtime-dependencies

- Cancel build feature was fixed, and the "cancel" request should reliably
  release all occupied builder machines (allowing them to be re-used, or
  terminated).