By now you had a 50/50 chance at guessing when Warframe 1999 would be releasing this year, and if you guessed December, you don't win anything, but you would be right
Briefly

"Our biggest update of the 20th century arrives this December when Warframe: 1999 launches on all platforms," explains Digital Extremes on the Warframe website.
There isn't much of the year left to release it in any way, but Digital Extremes has finally confirmed (roughly) when you'll be able to play Warframe 1999.
There's also a demo you can play right now too, if you can't wait any longer to try it out.
Creative director Rebecca Ford explained that its very European-feeling setting was actually inspired by one of its older games that you might have forgotten about, Dark Sector.
Read at VG247
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