The role was played by Christian Bale in part four titled "Terminator Salvation". 

Tom Hardy
Tom Hardy

Garrett Hedlund, who was previously considered to play John, is now rumoured to be short-listed for portraying young Kyle Reese, reports aceshowbiz.com

To be directed by Alan Taylor, "Terminator 5" will see action star Arnold Schwarzenegger reprising the title role.