The community forums is now open, based on Xenforo for those who prefer a forums format to discuss about stuff. Note that Mastodon accounts registered on this instance will work with Mastodon login by clicking the Mastodon button for login or registration. Logging in with Discord and WordPress.com will work too with more OAuth providers coming soon.
This morning, I updated Mastodon to 4.0.0rc2. If you notice any issues, report them on the community forums or email.