Hertzfeldt had hinted at the project in his online journal a few times:
january 14 2014 meanwhile, a third secret project that i cannot possibly turn down has just made itself known
march 20 i'm about 70 seconds into a rough first pass on this little project i can't tell you about, but this one is an interesting creature because it's somehow the first time, bizarrely, that i find myself tasked with delivering something under a given running time. everything i've ever done has always been sort of the length it was, just because it was whatever the length it was. so i've been measuring seconds closer than usual and trying to keep every moment disciplined, finding a way to cram all of this information in under the wire, which is a good exercise anyway, and have been really kind of amazed at just how much information can be stuffed into one minute. i am now deep into the stage of not leaving the house or seeing other human beings for days again, having long conversations with the cat, feeding myself becoming as routine as feeding him, the computer room trash mostly filled with granola bar wrappers.
july 29 during my skype meeting today the cat walked around the house and threw up everywhere he could as i sat there watching helplessly
On his Facebook page, he advises you to turn the volume way up:
Look, I hate how these couch gags are these weird little clock-eating mini-epics now, and I think farming them out to other people is an admission of failure on the part of the Simpsons creative team who can no longer think of quick 5-second gags on their own, and the quality animation only serves to highlight how stiff and boring the actual show is by comparison. But I'm going to put that all aside for now, because Hertzfeldt is an all-time favorite artist of mine and I like to see him succeed.