Who leaked the teaser

It certainly looks that way doesn't it? I agree, it was leaked by someone within the Studio(s). Either as a controlled leak, or someone lost their job because of it - which is highly unlikely, since it would be a rather stupid risk to take just for a short clip. Better yet, before the video went "viral", it was on YouTube under the title "Fatman Trailer" for I think a week or two before actually getting pulled. Which further leads me to suspect that the video was a controlled leak by the Studio in an attempt to gain traction on the viral marketing campaign. Either way - it did its job and fans are raving about it. So, my hat's off to you, [i]Warner Bros.[/i] and [i]Legendary[/i]! Looks like Godzilla is going to kick ass! Can't wait.

If it wasn't a controlled leak, then I'd say Gareth Edwards. There's just something about his smile that just screams "Damn right I did" on a video thumbnail on YouTube. If it was a controlled leak or whatever, well, it was someone at Warner Bros.