Here is the full list.
Forza Horizon 4: [4K, 30 FPS on X, Japan setting, Xbox Gamepass, Gameplay/Trailer Demo, Fall 2018]
Starfield: [Marketing Deal, Gameplay Demo, Open World sci fi RPG, Holiday 2018]
ScreamRide 2 [Xbox Gamepass, Gameplay Trailer, Holiday 2018]
Crackdown 3: [Xbox Gamepass, Gameplay Trailer, MP Beta, Holiday 2018]
Shadow of the Tomb Raider: [Marketing Deal, Gameplay Demo, Xbox Gamepass Fall 2018]
Sea of Thieves: [New content, Trailer, Xbox Gamepass, Fall 2018]
Ashen: [Gameplay Trailer, Holiday 2018]
The Last Night: [Gameplay Trailer, Xbox Gamepass, Holkiday 2018]
Below: [Xbox Gamepass, Gameplay Trailer, Holiday 2018]
Madden: [Marketing, Gameplay Trailer, Fall 2018]
Minecraft: [ Content Update, Fall 2018]
Battlefield V: [Marketing, Gameplay Trailer, Fall 2018]
Metro Exodus: [Marketing, Gameplay Demo, Holiday 2018]
Banjo-Kazooie Anniversary: [Gamplay Trailer,Xbox Gamepass,Fall 2018]
Borderlands 3: [Spring 2019, Xbox Gamepass, Marketing, Gameplay Trailer]
Ori and the Will of the Wisps: [Spring 2019, Xbox Gamepass, Gameplay Trailer]
Electric Madness: [Fun Racer, Spring 2019, Xbox Gamepass, Gameplay Trailer]
Splinter Cell: [Reboot, Open World, Marketing, First on Xbox, Fall 2019]
Anthem: [Marketing, Gameplay Demo, Fall 2019]
Halo: Genesis [Reboot, Splitscreen, new engine, Warzone 2.0, MP Beta 2018, Teaser Trailer Fall 2019]
Cyberpunk 2077: [Marketing, Teaser Trailer, 2019/2020]
Joanna Dark: [3P Action, Teaser Trailer, Holiday 2019]
If you ask for my personal opinion.
I can totally see Forza Horizon 4, Anthem, Cyberpunk being real and spot on.
Although, Anthem officially currently slated for March of 2019 meanwhile this says Fall 2019. So it either got pushed back again or simply it's not true.
No fable is strange to me.
Banjo Anniversary? Is this a reboot treatment AKA Spyro and Crash style? Only thing I can think of.
Joanna Dark in 3rd person action? Could be interesting. Need more info.
Borderlands 3 sounds real.
Splinter Cell is pretty much a given at this point with ghost recons splinter cell missions and Sam fisher appearing on the Inside Xbox show.
Halo Genesis. A reboot? Swear to God they said halo 5 is a start of a new saga/trilogy unless they decided to scrap the story and really start over.