http://blog.eu.playstation.com/2014/10/28/youtube-comes-ps4-today/
There's even a tag for it. But that is an uncharted 2 screenshot. Evidence of trilogy (currently trilogy being recognised as uncharted 3)
It could be PS Now. But share doesnt work does it on PS Now? And it'd definitely not have tags
EDIT: Apparently you cant screenshot / record ps4 now
http://www.gamefaqs.com/boards/691087-playstation-4/69795830
which makes sense because devs have to allow it. Why else would Uncharted 2 have an uncharted 3 tag, unless it was a placeholder for an early in dev game
UPDATE: SONY DELETED THE PICTURE FROM THE BLOG JUST NOW! CONFIRMED?! BRING ON DECEMBER!