How the hell would the devs not know about it? What if the devs will be in the stream?...
I feel like it's gonna be the gameplay demo they would have played during the e3 conference, but they are doing it now make room for newer stuff at E3(if Tidux is to be believed). And the game is likely still releasing in 2014 maybe and sony is doing this to counteract the negativity of the 2015 rumor. Seems shinobi might not have good enough insiders who might just be feeding him trash. People may not like that he keeps leaking and saying stuff so they want to lower his credibility. It's quite possible, but it is an out there conspiracy. LULZ.