Star Trek 3 is still in pre-production but Paramount is wasting no time in locking up their leads for a fourth movie as both Chris Pine and Zachary Quinto have signed on for a fourth turn as Captain James T. Kirk and Mr. Spock. It's reported that Pine may have received a $6 million dollar raise in the renegotiation.
The need for renegotiating arose when the third film got delayed. The original contracts signed by the cast was for three films, but they were signed in 2007 and under California state law, no personal service contract can bind someone for more than 7 years… hence technically the contracts were no longer valid as of 2014. This became a point of contention between the actors and the studio but neither wanted to go to court so hence the renegotiation. Pine and Quinto got their raises and the studio got a fourth movie option on the pair.