Update: (Thu 16th Apr, 2020 20:36 BST): These have now been officially revealed by Microsoft, although Borderlands isn't in the list (it's definitely available with Free Play Days, however).
Additionally, players can get 75% off the Standard and Legends Editions of F1 2019 throughout the promotion, while all Warhammer: Chaosbane versions are 60% off.
Original Story: (Thu 16th Apr, 2020 11:00 BST): There are four games in the Xbox Live Free Play Days list this weekend, including the recently ever-present Starlink: Battle for Atlas, as well as three new additions to the lineup.
If you fancy a bit of co-op fun, the superb Borderlands: Game of the Year Edition is available for free until next Wednesday, April 22nd. Following Codemasters' announcement of F1 2020 yesterday, racing fans can try F1 2019 all weekend. And finally, the Diablo-like Warhammer: Chaosbane is also part of the promotion until late Sunday night.
As always, remember that you'll require Xbox Live Gold (or Xbox Game Pass Ultimate) to take advantage of these Free Play Days titles. Xbox hasn't officially announced them yet, but we're assuming they'll be live from today (Thursday, April 16th) until Sunday, April 19th at 11:59 pm PDT, aside from Starlink: Battle for Atlas and Borderlands: Game of the Year Edition, which will be available until April 22nd and April 23rd respectively.
Will you be trying out Borderlands, F1 2019 or Warhammer: Chaosbane this weekend? Let us know below.