They didnt announce any big new games? Did you not see the show? You even put a link where they write several revealed exclusives maybe you should take a look. They also had tons of trailers for multiplats. It was a good show.
As for E3 2019... we'll see we will at the very least see Gears 5, Battletoads, Ori 2 possibly more on Halo and obviously a lot more. Yes there's a lot of good reasons to be excited for MS E3 this year.