If all the rumoured/speculated games are actually in a state to show off this week, then I'm not sure they will - there's space for 3rd-parties as well:
Could be there:
- Spiderman 2 (rumoured to be available later this year, so needs to start getting the marketing rolling)
- Last of Us Factions (how long has this been under wraps - probably revealed)
- Wolverine (teased before, insomniac seem to be the most efficient devs and could easily have another short trailer)
- Cory's game (much rumoured, presumably in production for a while now)
- Sucker Punch next game (Ghost of Tsushima 2? - been a while since GoT)
- Housemarque game (they are presumably working on something since Returnal was a "launch window" release)
- BluePoint game (MGS remake rumour mill and again Demon's souls was a launch title so it's been 3 years)
- Haven Studio's game (so good Sony bought the studio?)
- London Studio's game
- Guerilla's next thing (Horizon mulitplayer thingy)
- Astrobot 2 (likely candidate for VR treatment)
Less likely:
- Deviation game?
- Firewalk game?
- Sony Bend?
3rd-Party:
- MK1 (seems a lock)
- FF7 next instalment / SE block
- Pragmata? / Capcom block
- Death Stranding 2?
- Konami stuff?
This is just of the top of my head - and there are potentially a fair amount of PS studios reveals (of things that are well-known already) - and then there's 3rd-party stuff and potential surprises. I
suspect it will actually be quite constrained. Even if certain things could be shown off/are ready, there's no need to reveal things too early and put pressure on meeting deadlines etc.
I'm going to be happy to see something completely new/un-rumoured, as I'm not particularly interested in many of the things that are apparently coming - should be fun.
So my guess is that it won't meet expectations of many people simply because it's not in the dev teams interests to put together demos/slices for this sort of thing unless it's the beginning of a marketing push before release.