One month from today is Microsoft’s E3 which is Sunday, June 11th at 2 PM PST. There are lots of questions circulating around Xbox when it comes to games and especially what exclusives they have this year at the show. We can for sure expect Forza Motorsport 7, Crackdown 3, and State of Decay 2.
According to insider Shinobi on Twitter, Microsoft has marketing rights to a major unannounced AAA title.

So there's a major unannounced AAA that Microsoft has marketing on. Not bad Xbox. Bring on E3.

— Shinobi602 (@shinobi602) May 11, 2017

One game that comes to mind for lots of people is recently leaked Assassin’s Creed Origins which is by Ubisoft or it could possibly be an EA or Bethesda title as the companies do have a good relationship together.  We can for sure expect to see this game on stage at E3 according to Shinobi’s tweet saying “Bring on E3”.
There’s a good chance we could see a good amount of 3rd parties at the Xbox Briefing as everyone wants to show off their game on the upcoming powerful console, Project Scorpio. Phil Spencer did say that there will be lots of different genres at the conference this year.
We will have to wait and see.