Uhm, Guys...?

You DID see the Merlin season 4 trailer they showed at SDCC, right? 'Cause usually that kind of thing is all over my flist, so I assumed that this year there was no promo at the con, but out of curiousity I went looking on YT just now and...

GUYS! GUYS! GUYS!!!!!!!!!111111!!!!!!!! ( SPOILER OMGWTF )