With nearly three years gone since the last movie premiered, Kurt Fuller offers an uncertain update on Psych 4. Following the end of the long-running USA Network mystery comedy show, the franchise continued with a movie sequel featuring the return of its original cast, with the success leading to plans for five additional installments from creator Steve Franks. Thus far, only two of these sequels have been released, while Psych 4 has remained in a state of development limbo due to a variety of reasons.

https://screenrant.com/psych-4-delay-future-kurt-fuller-response/