Season 3 And 4 are happening
http://bloody-disgusting.com/news/3424085/syfy-just-renewed-channel-zero-third-fourth-seasons
"Touchdoooooooooooooooooooooooooooooown Auburn" - Jim Fyffe
I kind of wish they said which stories they'll cover in those, but I guess there's no way they picked them already.
But man, second season is airing in October? They released that teaser way too early.