Oh no I don't assume all Sony devs  do, but we know GOW 4 is not going to launch before march 2017 (PSX expo), the last guardian will not release anytime in the near future but apparently Japan studio's has nothing better to do. From some developers we know that they are making a PS4 exclusive, but nobody knows something remotely close about those projects. For all I know it could take years for those project to finally release and are all cinematic games.

If there's any time for Sony to tease it is now and yet they have gone full radio silence to. So yeah I am going to assume many of those studio's are working at a game but all those projects are way to ambitious for the smaller studios and it is going to take years for completion. MS on the other hand sends out a tease once in a while which indicates there games are on schedule and looking awesome. 

Jumping the gun so quickly. Would love to see this thread get bumped after the conference. You might have some crow to eat.

Sly 5 wouldn't cut it, just as LBP3 fell flat

their sales will obviously be fine but It could very well be a another dissapointing E3 for sony fans where they turn into MS circa 2010, and just spend an hour giving third parties stage time to show of their tired annualised IPs and multiplatform games we've already seen. Hopefully not as there are now 1st party devs we know are due a big announcement. 

Guerrilla Games: Horizon
Bend Studios: ???
Santimonica: GOW4/New IP?
Media Molecule: New IP
Japan Studios: Gravity Rush 2 (+The Last Guardien :P)
Extended previews: Ratchet and Clank, Uncharted 4
+
Morpheus Games.

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I don't think they're going to show up and have nothing to show off,but I feel they are gonna have a lackluster E3 in general. I just really hope they dont spend 20min hyping PS4 sales numbers and showing more charts and self boasting but instead just show what everyone wants to see,games

Their first party support has been abysmal till now. Those who are saying, first few years are slow need to see how competitor is doing. I am really disappointed.

There is a Sly movie in production. Any game is likely to release close to that, and it is scheduled for sometime in 2016. So there won't be a Sly this year

You know that there are so much other studios from Sony with unannounced projects yet? Last year holiday game was LittleBigPlanet 3, which was first announced at E3 2014.

Possible announcements:
Naughty Dog (2nd game)
Media Molecule (new game)
Guerilla Games (Horzion)
Sony Santa Monica (God of War 4)
Insomniac games (2nd game)
Sony Bend (horror game / PS Vita game)
Guerrilla Cambridge (new Sly Cooper, new Killzone, new MediEvil or new IP)
Japan Studios (Gravity Rush 2)

Yeah I definitely see what you're saying. Microsoft 2010-2013 was pretty dry in 1st party and they relied too heavily on 3rd party. From what remember, Sonys console takes a few years to start churning out first party. 

Horizon will probably be shown for 2016, Santa Monica has GOW 3 for summer that might be pushed to holiday, also Tearaway might be coming this holiday as well. 3rd party deals will happen as well, but like you, they need more 1st party announcements. 

They didn't mention sales last year, and when they do at conferences they don't spend long on it. Be more worried about 20 minutes of non-gaming nonsense, like Powers from last year. Hopefully they don't make that mistake again.