The actor told IGN that the new run feels different to last year's episodes.
McHale said: "This season, it's all over the place as far as settings and what we're doing. It's different than last year. I don't really have anything to compare it to.
"There's nothing ever typical about it, which I love. The only familiar thing about it is being around the study table."
McHale, who also hosts E! TV series The Soup, revealed that the first six episodes of Community's new season are "pretty out there".
"We... know that this [show] is going to be about the study group that has a lot of dysfunction and will find themselves in some incredible situations," he said. "But the first six episodes that we have shot are pretty out there. It's great."
Community creator Dan Harmon previously claimed that the show will now be "weird in creative ways" to give fans "more insight into the characters".
Community returns to NBC tonight at 8/7c.
> Community Joel McHale, John Goodman Q&A: 'The new season is bigger'
Watch a preview video for Community's third season below: