It sure does, but I don't remember many big games from Sony that did this.Uh yes? It happens all the time.
It does feel like they should be having a lot under wraps still, but it has felt like that for the past two years already and it hasn't resulted in many (big) exclusives for PS4 yet so far.
I'd say the chance is bigger they'll secure a couple of big marketing deals with 3rd parties with one relatively big first party exclusive to still be revealed for 2015, but nothing compared to Uncharted.
Surprise me, Sony.
Edit: they do of course still have a lot of games announced for 2015, just not a single title that is comparable to the 3rd party big guns.