This 'leaked' Left 4 Dead 3 teaser is a fake

Valve confirmed that the teaser is in fact a fake.

It's still pretty cool though. You can read my our initial thoughts on the presumed-fakeness of the video in the original story below:

Original story: 

An amazing secret that turned up today on YouTube has many individuals thinking about whether another Left 4 Dead game has all of a sudden sprung a major hole, or if Valve is maybe attempting its hand at viral showcasing. It could be—Valve did as of late bother another "flagship" game coming this year, all things considered, and this wouldn't be the first occasion when we've heard murmurs of Left 4 Dead 3—yet the far more noteworthy probability, sorry to learn, is that it's a phony. 

For a certain something, the video is finished and cleaned however simply natural, which isn't at all how Valve moves: Left 4 Dead is hysterical and instinctive (look at this L4D2 secret for proof of that), and this, for all the climate it stirs, isn't. The zombie hand toward the end is suspicious too, in light of the fact that it's an immediate duplicate of the first L4D hand instead of something showing the third game in the arrangement. Joke about Valve's failure to get to "three" maybe, however I can't see it breaking a set up example on a noteworthy game establishment just to gesture and-wink at a senseless inside joke. 

I think the nearness of certifiable items in the game, similar to Pepsi and Life, additionally indicates phoniness. You can't simply toss stuff like that into your game or your promotion materials without some kind of permitting bargain, and there's no proof of that—and I don't see Valve doing that kind of thing in one of its game universes at any rate. 

So it's conceivable this could be an amazement L4D3 spill, however truth be told, exceptionally, very (I mean, extremely) somewhat conceivable. We've connected with Valve to ask, in the event that something goes wrong, however I'm sufficiently certain to call it now: In all respects pleasantly done, truly, yet additionally exceptionally phony.