This addon provides 2 commands:
/recreategroup save: Saves all members of the current group.
/recreategroup restore: Kicks all previously saved members out of the current group, leaves the current group and invite all saved members to a new group. You must use this command inside a macro to work correctly.
Also: When you get an invite from your previous group leader, you automatically accept that invite.
We use this addon when doing worldquests together with 2 people: We also search for random people via the dungeon finder. After we finish the wq, the group leader uses the restore command to form a new group with the 2 other poeple.