Full release notes available here: https://help.the-goblin.net/update-16th-august-2022-sharing-access-roles-contributions-and-more/
Access roles to control who has access to your campaign and what they can see. Create roles in the campaign preferences and set the role type. Give the generated access key to the users you want to have that role, then when they log in, they can enter the key to join that role. Multiple people can use the same access key so you can minimise the roles needed.

Users accessing a shared campaign with a CONTRIBUTOR role will be able to append their own notes to objects that will be appear under their own name.

To allow for some of the new functionality, the menu bar has had a bit a shuffle around! Instead of showing your logged-in email address at the top of the page, the user menu has been reduced to an icon and there are other icons that appear alongside, depending on the campaign context.
See the full release notes for more information!