Elysium takes place in an Enclave (E1). It is an underground city. It is a fully functional city, although, it is not in a good shape and due to lack of resources and sadly, bad leadership, it is going down. The players are playing som sort of special police (i don't know what they will be called in English. It is Gestapo-like). The players are sent out to solve crime, often with a political agenda. This is a world that is more like a cyberpunk world than an apocalyptic one. Also, the players will have a hard time trusting people here, perhaps even each other. The campaign, "Guardians of the Apocalypse" (this is my free translation of the title "Katastrofens Väktare")
Elysium will be the last of the "class" expansions. It will stand on its own but of course the idea is to combine it with Genlab Alpha, Mechatron and of course the base game itself , Mutant Year Zero. There are (as usual) a chapter with extra projects (mostly civilization creation projects, like "Code of Laws", "Social Hierarchy" and "Coinage" (my free translations of the project names).
Hindenburg is throwback to the old game Mutant. The original game (1984 and 2001) had a setting will small kingdoms and city states, about a hundred (perhaps two) years from MYZ. The old Mutant games had very rich and colourful setting, mostly about one of these kingdoms called Pyrisamfundet (Pyri Community ?). The name of the capital is Hindenburg. The setting has zones that you can travel to but also cities and states. A little bit of wild west meets steam punk meets apocalypse. The expansion Hindenburg is suppose to take place some years (a generation of so) after what happened in the 2001 campaign setting. I don't know if they are going to just translate the Swedish Pyri-setting or if they are going to write up something that could be placed everywhere. We don't know much yet about this.
Besides these two things we have Mutant Ad Astra (they have shown some concept art of it, sort of. We don't know much about this either. Not more than it is mutants in space.
“I’d say thistles, but nobody listens to me, anyway.” - Eeyore