You have to solve your enthusiasm because these Xbox game pass is already a great deal for gamers but it's just a piece of cake. This is starting on March 20 with the 'Sea of Thieves', it enhances the Sony one-up on a large scale. Microsoft's Microsoft Exclusives of Microsoft will be added to those Xbox game passes, which will be included in 'same date as their global release'.
Source - https://techaeris.com/2018/01/23/microsoft-exclusives-coming-xbox-game-pass-release-day/