I doubt we'll get the DVD of season 4 with commentary that Harmon joked about. He watched Season 4 and he was not happy at all with the show or with Sony.
It was weird. I think I feel pretty comfortable in expressing that [Season 4] is not ‘my cup of tea’. It’s obviously not somebody doing what they do. It’s very much like an impression. And an unflattering one. It’s just 13 episodes of, 'I’m Dan Harmon! Die Hard! Uhh!' I’m going back to work tomorrow and I just think, ‘Do I talk like that?’
Basically saying what most fans said all season long. It rarely if ever felt like Community, and always felt like someone doing an impression of Community.
He also said he'd always wanted to get Bill Murray to be Jeff's dad, and was upset when he saw Brolin in the role. He mentioned that he's still trying to get in touch with Murray for season 5. In what capacity, who knows?