I think Sony are going to go in guns blazing this year. Last year they only had The Order. Perhaps they saves everything for this year.
Here is how I think it will go
Talk about PS4 sales, fasting selling console of all time
Firmware 2.0, more social features, YouTube support, Sleep mode, MP3, DLNA. Also user interface and features upgrades such as not gifting and having a wishlist for PSN store.
Instant Game Collection June revealed to have Killzone Shadow Fall. Also in addition Injustice and Knack will be part of IGC for the rest of this year June-December
PS Now launch titles and release date. 1 Month free trial for PSN+ members
PS1 and PS2 Classics support, PS4 natively emulates the games. PS2 Classics have HD support, trailer is shown with games like Ark The Lad Twilight of the Spirits and Dark Cloud now with HD graphics similar to PCSX2.
Vita is mentioned, new trailers for Gravity Rush 2 and other already announced Vita games. Finally Final Fantasy Type 0 localization is announced.
New Final Fantasy XV Trailer
New Diablo III Trailer and release date
Destiny Gameplay Demo and Beta relese date
GTAV Next Gen port Trailer
Batman Arkham Knight Gameplay Demo, and exclusive DLC
Assassins Creed Unity Trailer and exclusive DLC
Talk about how F2P games have been a success on PS4 with Planetside 2 Trailer with release dates and a Everquest Next teaser trailer for PS4, and LittleBigPlanet Hub which is now also on PS4. Finally Fortnite from Epic is announced for PS4
Yoshida comes up stage saying the following games are exclusive to PS4
Deep Down Trailer
Drive Club Gameplay Demo showing off not only in game gameplay but social features with smartphone
New Media Molecule IP Trailer
The Order Gameplay Demo turns out to be mindblowing, similar to Uncharted 2 gameplay reveal
Project Beasts Trailer
The Last of Us release date to be July and new Uncharted 4 Trailer with only 2015 date mentioned
Yoshida comes back to close the show, and pulls out the one more thing surprise, The Last Guardian re-revealed for PS4
I think this time Sony will skip announcing Indie games, as they did a minor indie game reveal not too long ago. Perhaps a sizzle reel trailer. I think Gamescom will be saved for big Indie games like Rime, as well as proper gameplay demo of Media Molecule IP instead of just a trailer. I also expect Sony to briefly mention Morpheus but announce nothing new. Again Gamescom will be saved for motion games, perhaps Zindagi is working on a new Move game.