I was going to say Galaxy S4 initially, until I saw those huge bezels top and bottom (the silver sides is what made me think that). But then when they zoomed in, I noticed the lock and volume buttons are both on the right side (they're on opposite sides on the S4) and it has a multitasking soft key on the bottom right. I couldn't tell if they were on-screen soft keys or what (plus, there's no physical home button, so it's definitely not a S4).
I'm stumped.