The Gurney Progression is being BETA tested this week. Final loot and bonuses will be in next week. The Carabin Progression has all maps done (25 in total), and can be either solo played, or once you go through and collect a set for others, or enough items for them to start, you could take someone with you, (if you like to share...). The conversations alone on the Carabin Progression are 'mind bottling'... Nuff said.
The Carabin Progression cannot be attempted until you find some random items (go figure), and you have completed the Gurney one. So, start exploring.