Terminator will be returning in 2015, Paramount announced on Tuesday (26th June 2013), the script is already in the development. Laeta Kalogridis (Shutter Island) and Patrick Lussier (Drive Angry) are currently working on the project. No casting decisions have been revealed and it is unknown if Arnold Schwarzenegger will return to the role as the Terminator. 

Arnold SchwarzeneggerArnold Schwarzenegger at The Last Stand premiere in London. 

The James Cameron films follow, for anyone who hasn't visited earth anytime in the last 30 years, the adventures of John Connor. Initially only a glint in his father's eye, Connor is pursued by an assortment of robot assassins from the future. The first robot was played by Arnold Schwarzenegger who has appeared, some form or the other, in every Terminator film since. 

It's likely he will make an appearance in the forthcoming film. His likeness was featured in special effects form in the last film, Terminator Salvation, starring Christian Bale and Sam Worthington. Schwarzenegger has much bigger things going on at the time: bizarrely being the Republican Governor of California. His term ended in 2011 so he is now free from public duties, should he wish to be involved. 

Sam Worthington
Sam Worthington who featured in Terminator: Salvation.

The first Terminator film was shot in 1984 and was an instance hit. The following three films have proved popular with fans new and old. Amazingly, and largely due to Schwarzenegger's involvement, the first film has retained its audience and is regarded as a classic action movie. 

Schwarzenegger plays the perfect robot, largely owing to his complete inability to act and permanent facial expression. His return would probably secure the success of Terminator 5.  

Terminator 5 is due out in cinemas 26th June 2015. 

Christian Bale
Christian Bale played John Connor in Terminator: Salvation