I have a feeling Tomb Raider is going to be treated like a stepchild now.
It's not going to be covered at all. It's an old game.
It's up to Square Enix to release a trailer with the release date if they wish.
About the conference I don't expect hardware news since new hardware SKUs will be available in september at the earliest.
They have many new games and updates to talk about.
God of War 4 and Bend's new game will be the big new first party announcements.
Horizon will get a new demo as previously announced.
The Last Guardian a new trailer with the release date.
GT Sport might even skip E3 if the amount of news on May 19th is substantial, basically Polyphony plays its own game LOL.
Then I expect updates for key upcoming third party games like FFXV, FFVII remake (can't wait to see Tifa and the Wall Market

).
Shenmue 3 might get its first gameplay trailer among with the news that Sega has finally found a way to remaster 1&2.
Too soon for Kojima's new game, other stuff like Gravity Rush 2, Ni No Kuni 2, Detroit, Wild will be kept for other events.
Then the usual amount of third party stuff where they got marketing rights (boring COD demo is inevitable).
A 10 minutes section will go to PSVR games since the launch is getting close and they need to promote it.
Basically I expect a solid show made of a few key new announcements + lots of updates about past big announcements.
Only potential megatons I see are: Crash is back, RE2 remake becomes ''play it first on PS4", Rockstar and Sony announce a deal for the next Red Dead game.
And I doubt any of them will happen.