He's definately not definately dead. While the video did bring up some good points, I still feel that there is a possibility (albeit a low one) of Kenny's survival. I got the Christa death scene, where Kenny most assuredly does not give up. It's not inconcievable that he could have found a door somewhere and escaped the building, because, really, who builds a room with no doors? The fact that many of his death noises were cut out indicates (in my mind) that TT wants to leave his character open for the next season. If they use him then, then we know he survived. If we don't see him, then I'd think that he was really dead.
It's much less likely that he made it out of the alley, admittedly, but this may be a point that TT uses in Season 2. Perhaps, depending on which version of his "death" you got, that dictates his fate in the second season. With Ben, he is dead. He died in the alley after giving up and locking himself in. With Christa, he's alive and found a door out of the room (just barely) and managed to find a safe place somewhere. Since he doesn't appear to give up in that version, he could still decide to live on and perhaps link up with Omid, Christa, and Clem after he escapes Savannah. Here's hoping for Kenny in season 2.