Going to have to wait until Treehouse is done and dusted but in terms of stuff that we actually saw playable material of, Luigi's Mansion 3 and Astral Chain are up there. I did not expect Luigi's Mansion 3 to take every criticism of 2 to heart and improve ghost designs, go back to a non-mission based structure, and provide what I actually wanted all along from a Luigi's Mansion sequel. Not only that but it looks extremely gorgeous, Next Level Games are masters at bringing the personality out front and center in the Mario series. Astral Chain looks like yet another instance of Platinum outdoing themselves in terms of combat systems by doing something new and unique that isn't beholden to their codified Bayonetta archetype.
As far as reveals go? No More Heroes 3.