https://www.cnet.com/news/star-trek-4-movie-reportedly-shelved-but-more-series-coming/

In August 2018, the Hollywood Reporter reported that Chris Pine and Chris Hemsworth (who played Kirk's father in the 2009 Star Trek film) might not rejoin the series due to contract problems. 

With both the director gone and two of the stars walking away due to salary disputes, Star Trek 4 sadly won't be engaging audiences anytime soon.