I'm pretty sure Dan Harmon was confirmed way back around the kickstarter. In fact he's even talked about it on his Podcast Harmontown.

It's not the city that is blocking it, it is this stupid non-profit organization that wants to preserve a parking lot. I'm a bit bitter since I am a Chicagoan and was looking forward to this museum

I'm surprised at how many people I've talked to actually think Glenn is dead. Come on people, they would not give a great character such a shitty death, he's destined for a far worse death. It didn't even look like he was getting ripped open, it's opbvious that the other guy fell on top of him and the zombies are…