He has said this during an interview with the entertainment website - Deadline.
“Nobody on this planet knows or has thought as much about Thundercats as I have,” Wingard had said.
Reportedly, he is such a fan of the franchise that years after it went off the air, while he was in high school, he hand wrote a 272-page screenplay for a Thundercats movie. A script he still has. So, after Godzilla vs. Kong started to do well, he talked to producers who were in charge the property and things moved on from there.
“I saw this as an opportunity to do a new type of fantasy sci-fi spectacle film that people have never seen before,” he said. “It’s got a rich mythology; the characters are fantastic. The colours. I want to do a Thundercats film that takes you back to that ‘80s aesthetic. I don’t want to reinvent the way they look; I want them to look like Thundercats. I don’t want to do it live action, either. I don’t want it to look like Cats, I don’t want those kinds of issues — no disrespect to that director, whom I don’t mean to throw under the bus any more than everyone else has. I want to do a movie you’ve never seen before. A hybrid CGI film that has a hyper real look and somehow bridges the gap between cartoon and CGI. That’s the starting point, and [frequent collaborator] Simon Barrett and I are getting into the script now.”
(Excerpts : Gizmodo)