In general, I expect Xbox to have a really good show. Sony will not reveal much because they spread their announcements around to other shows, I also believe they're trying to make PSX their biggest show of the year and that will be where all the huge reveals come. They will get by at e3 with third parties, indies and one new first party game.
* designated co-marketed multiplatform games
Microsoft
- Quantum Break demo
- Cyberpunk 2077 gameplay reveal*
- The Division gameplay*
- Gears Remaster
- Halo 5
- Rise of the Tomb Raider
- Scalebound gameplay
- Crackdown gameplay
- Perfect Dark reboot teaser from Rare
- Battletoads reboot announced
- New Gears Of War teaser
- NFL all games streaming announced
- Holiday 2015 Xbox One slim announced - $349 + Halo 5 pack in
Sony
- Call Of Duty demo + PS4 bundle*
- Destiny expansion announcement*
- Star Wars Battlefront demo + PS4 bundle*
- Assassins Creed Victory demo*
- Indie showcase with focus on No Mans Sky and Hellblade
- Bloodborne dlc announcement
- Uncharted 4 new demo + Story Trailer + Q1 2016 release date
- Sony Bend new horror IP trailer
- God Of War 3 remastered gameplay trailer
- God Of War reboot teaser
- New Playstation Vue channels + deals
- Immediate price cut to $349
- FFXV demo + release date + timed exclusivity announced*
Others
- AC Victory, The Division, Rainbow Six, Far Cry 5 (2016) and Beyond Good and Evil 2 (reveal) at Ubisoft
- Mass Effect 4, new Visceral Star Wars games plus all the usual reveals at EA
- Fallout 4, Dishonored 2, Doom at Bethesda
- No Half Life 3
- No The Last Guardian