Rush Hour 4

Rush Hour 4 was planned sequel to 2007 movie Rush Hour 3 both Jackie Chan and Chris Tucker were supposed to come back.

Plot
Unknown

Why it was cancelled
Unknown because days after Chris Tucker and Jackie Chan teased it Jackie Chan said rumor is false.

Result
Rush Hour 4 is permanently cancelled

There was Rush Hour series at CBS but it was cancelled after 1 season

News
https://www.dailymail.co.uk/tvshowbiz/article-6909265/Jackie-Chan-says-Rush-Hour-4-isnt-happening-days-Chris-Tucker-said-sequel-coming.html