I expect:
-Spiderman Miles Morales gameplay
-Some extra details on hardware, OS, BC, Remote Play or PS Now
-Date, price and preorders
-Probably a list of the release date (and maybe 2020) PS5 games
I'd love to get but I'm pretty sure won't happen:
-GoW 2 announced with a cinematic trailer+gameplay demo
-Bloodborne 2 by Sony Japan, with From Software helping & overviewing
-Kojima and Junji Ito announce their horror game
-Uncharted 5 with the new Sony San Diego studio with ND helping & overviewing
-Sony buys R8 Games an renames Pacer (previously known as Formula Fusion) to make it a new Wipeout game
-Sony buys Kojima Production, Konami, Quantic Dream, Ready At Dawn, From Software, Housemarque, Bluepoint, Supermassive and Playboy.