We're going to try and release a bugfix release for 0.520, dubbed 0.521. The plan is to do this relatively quickly, using a release branch forked from v0.520, cherry-picking only essential fixes for announced features and for regressions since 0.510. I am going to be the release manager. We will have a new blog post. I'm aiming to do the release on Monday 7/24.

I plan to also create a release branch for typeshed, so we can cherrypick typeshed commits as well.

If you have a mypy or typeshed bugfix (already merged on master) that should really go in please mention it here (I have a few in mind already).