Specifically, Marathon's gameplay reveal is set for April 12th at 10am PDT / 1pm EDT / 6pm BST. You'll be able to watch the full thing on Twitch, and we'll be recapping it here at Pure Xbox ASAP after the event as well.
As a reminder, here's what Bungie says about Marathon:
Marathon is a team-based extraction shooter and the first completely new project from Bungie, the creators of Halo and Destiny, in more than a decade. Set on the mysterious planet of Tau Ceti IV, Marathon will see players inhabit the bodies of Runners, cybernetic mercenaries who have been designed to survive the planet’s harsh environments. While exploring the lost colony that once inhabited the surface, players will search for valuable loot including new weapons and gear.
Bungie is obviously a PlayStation-owned studio these days, so there's been some debate about whether Marathon will launch on Xbox, but it's once again been mentioned as an Xbox Series X and Xbox Series S game this week.
All that's left is to see what Bungie has in store for us - here's hoping it's going to be as good as Halo / Destiny!
Eager to see what Marathon is like? Will you be watching the reveal? Tell us in the comments below.