Rugrats (2021 movie)

Rugrats (2021 movie) was an unnamed and cancelled film that would've been written by David Goodman. It was originally set for a November 13, 2020 release but was been pushed back to January 29, 2021 by Paramount and Nickelodeon Movies before being pulled from Paramount's release schedule on November 12, 2019. It would've been the fourth film in the franchise and would've also been the first to be live-action with CGI animation. It was an attempt by Nickelodeon's effort of reviving the series for a new generation of audiences. It was to be released under Paramount Players.

External Source
Rugrats 2020 on Variety Fair

Confirmation
Nickelodeon confirmed the news with a post on their official Instagram.