MS will never announce a new AAA console exclusive IP from its studios. It's Gears, Forza, and Halo from now until the end of time. -_-
MS: We bought a bunch of new studios. Also, we'll be talking about XB2.
Me: Guess I better watch that E3 Conference then.
MS: Gears, Forza, Halo. Scarlett will be really powerful, and have an SSD.
They've only owned those new studios a year, what do you expect? It takes alot more than a year to build a AAA game. We already know the Initiative is working on a new AAA IP, and Playground's RPG studio is working on a AAA as well. Technically The Outer Worlds from Obsidian is AAA and MS owns the IP now. The first game in the series is multiplat because MS bought them after Obsidian had made a deal with Take-Two, but future games in the series will be Xbox exclusive, so technically that is a new AAA IP for MS assuming it sells well enough to get sequels.
Outer Worlds isn't exclusive though. Not even console exclusive. Outer Worlds 2 being only on PC/Xbox would help a lot. But that's not an IP MS grew. I'd really like to see them take their new studios and make something new. Even an announcement with just a title screen, and no trailer would have been fine. Bayo 3 and Metroid Prime 4 got announced last year, but neither will be out until 2nd half of 2020 at the earliest. They could have brought each head of their new studios onstage and asked them what games they wanted to make. Anything.
I don't even know what new studios they picked up. It was supposed to be 14, but all I know of so far is Ninja Theory (regulated to making a melee Fortnite game), Obsidian, and Doublefine.