I'm not on all the social media for Wargames Atlantic (I'm canceled from Twitter and Facebook), so it's possible some of the fluff has gotten by me, but as near as I can tell, Wargames Atlantic are keeping a poker face on what their wargaming fluff might look like. I've not even heard about what the progress on the wargames rules (and any additional fluff that comes with them) might be.
Up until WGA started talking about wargame rules, it seems like they focused on creating cool models first, and world-building as an afterthought... in any event, brief paragraphs from the back of the boxes or the webpages are all I've seen so far!
For those who haven't seen it yet (or haven't seen it lately), this is what Wargames Atlantic says on their website:
Death Fields: The Greatest Sport is War!
For thousands of years, advanced alien civilizations have visited the Earth for one purpose: to steal their bravest warriors. For centuries, the cream of Earth's soldiers have been taken against their will to fight, die, and be reborn in arenas throughout the galaxy.
The Game Guilds provide some of the most watched sport in the known universe with matches broadcast in thousands of systems. A perennial favorite of sports fans everywhere are the humans - a primitive race from the far edge of the galaxy.
Over the millennia, the finest warriors of that backwater planet have been brought to the arenas to fight each other and a host of other sentient species and deadly creatures. Even now, thousands of years since abductions began, Recruiters still acquire the best of Human space's warriors for the games.
The humans go on in their tiny light-years bubble of space attacking each others colony worlds, believing themselves the most advanced race in the universe while the rest of the galaxy watches their immortal ancestors fight and die in the Death Fields...
The Death Fields will be a constantly expanding range building toward a future game release once we have enough plastic sets and factions.
Sounds like it's all pretty much open-ended, with room for anything you can imagine, especially for the aliens! (I expect the rules and fluff will likely be open-ended enough for anyone to import their favorite wargaming mini faction - including aliens - into the setting.)