Warframe "Jade Shadows" will drop in June, and will feature a new single-player narrative quest, new cosmetics and the 57th Warframe, Jade.
Warframe: 1999 officially has a demo up on Steam that you can play right now, while bopping along to the official song 'The Call'.
TNS: "Warframe 1999 is not a new game, but it's a significant milestone and homage to the developers' struggle and success."
TNS: "We interviewed Warframe's most pivotal developers, here's what they have to say about the game and Warframe 1999."
