So far, Microsoft has announced that approximately 100 games from its existing catalog will have 4K updates available including Halo 5, Halo Wars 2, Forza Motorspot 7, Fallout 4, National Basketball Association 2K18, Project Cars 2, Rocket League, and The Witcher 3: Wild Hunt. I like the momentum we have and I'm confident all the big games will be great on Xbox One X. If you own an Xbox One then this will allow you to make the switch quicker. And the more exciting upcoming game, Sea of Thieves, is not coming soon either so where are the most-play games to grow the Xbox brand and compete with PS4? That excuse doesn't really fly with Ark, though, which is a T-rated game with an older fan base. "Unfortunately it's a commercial discussion between ourselves and other stakeholders". That suggests there may be some financial issues between the parties involved that are preventing cross-console play from moving forward.
Microsoft announced via their support Twitter page that they are aware of the outages, and are now investigating.
However, Microsoft has not given up- speaking to GameReactor, Xbox's Aaron Greenberg confirmed that the company is still talking to Sony about making cross platform play a reality. On the other hand, consoles having HDR support are those with the regular HDR10 standard, which is also used in the Xbox One S, but there will be no Dolby Vision support in them.
Microsoft also announced that Shadow of War Xbox One S bundle will be released on October 10.
If Sony doesn't want to let Xbox One players onto its network for competitive reasons, that's a perfectly understandable business decision.