Actor Josh Brolin is rumoured to be replacing Arnold Schwarzenegger in his iconic role as the Terminator in the franchise's fourth film.
According to Comingsoon.net the 'No Country for Old Men' actor, who will also be playing American President George W Bush in the new biopic 'W', will play the lead in 'Terminator Salvation: The Future Begins'.
Christian Bale will also star in the film as John Connor.
Shooting on the project, estimated to cost about $150m, began this week in New Mexico.
However according to Reuters there are concerns that there could be an actors' strike in July.
Following the 100-day screenwriters' strike that ended in February, many studios have avoided launching new productions before the Screen Actors Guild contract expires on 30 June, a date being treated as a de facto strike deadline.
Steven Spielberg called off an April start to his film about the 1968 trial of anti-war activists, 'The Trial of the Chicago 7', but Michael Bay is still hopeful of an early June start for a sequel to his film 'Transformers'.
'Terminator Salvation: The Future Begins' is due for release in May 2009.
