Here's my predictions.
First Party:
* Horizon II Kicks-Off the show - Takes advantage of Ray Tracing, and SSD speeds, allowing for a more complex world and seamless fast travel. Gameplay demonstrates how it uses DualSense. Pulling back on the bow is conveyed with the adaptive triggers, HD haptics convey various textures in the world, and Gyro aiming is finally confirmed. Horizon II launches along side PS5.
* New London Studio game - Built as a key demonstration of DualSense. Showcases Motion used in conjunction with Haptics, as well as the Improved Touchpad, and Voice Commands using the built-in Mic. Also a launch title.
* PixelOpus shows off new IP - Action/Adventure title with a Unique hook
* Insomniac announces a new Ratchet & Clank - Disregards the PS4 reboot, takes place after the Future Saga, slightly darker
* Bluepoint announces Demon's Souls remake - Updated with enhanced visuals, 4K output, DualSense features, coming 20
* Gran Turismo 7 announced - First new mainline game in 5 years, shows off Ray Tracing and DualSense features.
* New Multiplayer game announced - Hero Action/Shooter that leverages SSD capabilities, available 2020
* Japan Studio reveals 2 games - One, a new Ape Escape title, showing a new art style, bright colors, DualSense controls, and how SSD can enhance the action. The other a new IP, fresh from the Gravity Rush team, a game that showcases the potential of both Ray Tracing and SSD speed.
* Spider-Man 2 Teaser - Green Goblin is the Villain, no gameplay, just narration over NY.
Third Party:
* Capcom announces Monster Hunter World II - World is Massive this time, new weapons shown Monsters are bigger than ever
* Ubisoft shows off Assasin's Creed Vallhalla - Shows off features exclusive to next gen, locations, and new gameplay elements
* Tekken 8 unveiled - New Characters, Next-Gen graphics, Special Guest character. Console exclusive to PS5
* Tales of Arise New Trailer - Story overview with voices, new battle system showcased
* Square Enix showcases 2 games - Brand new Bushido Blade, and teaser for Final Fantasy VII Remake Part 2, exclusive to PS5
* Activision shows the next Call of Duty - Explains new features for Next gen, new setting, 2020
* Bethesda talks about Starfield and Elder Scrolls VI - First look at gameplay of Starfield shown, and what new things Next gen can bring to these games.
* Sega shows off Yakuza: Like a Dragon, alongside a brand new Sonic game - The Sonic game is a spiritual successor to Sonic Adventure, SSD allows for a new kind of speed.
* Activision also announces a brand new Crash Bandicoot - First new main game in over 10 years, timed exclusive for PS4 and PS5
* Bandai Namco announces New IP - Exclusively for PS5
* Shuhei Yoshida shows off indie titles coming to the system - Various Indies are shown.
I think this can all make for a pretty solid showing by Sony.