Warframe's Empyrean expansion got a new trailer at The Game Awards tonight, and it also delivered a nice surprise for PC gamers—the expansion is live on PC, right now.
In Empyrean, you can customize and pilot your Sigma Series Railjack battleship in four-player co-op. We first heard about the ambitious Empyrean expansion at Tennocon last year, and learned more this summer (opens in new tab).
You can play Empyrean solo, too, but it's really designed for a full four-player crew, though 2020 will bring updates more suited for solo players. There's also a free flight mode where you can practice piloting your Railjack without having to do battle.