Both features were in the planning stages for a while and initially intended to release last year, before being delayed a bit for more testing and polish.
Once the update goes live, you can queue in a group of 1-4 players, choose a role, and enter the cross-world Expedition group finder. Either get randomly matched or select a few criteria to control your experience more. The random option is fastest and also comes with a daily completion bonus to encourage its use. Once you have entered the Expedition together, a random group will also get a 15% bonus to damage, healing, and Max HP to help buffer the lack of familiarity between players.
Both normal and mutated Expeditions will be included, with M1 and M2 also included. M3 is not included, since they want to preserve the competitive and high skill required.
Development on that was, in an earlier form, intended to help people find Expedition groups on their own servers, but that wasn’t addressing other issues, like population.
