This is from IESB.NET
Spoiler Space
"Romulans from the future, most likely TNG time frame lead by a Romulan named Nero, played by Eric Bana, finds the City on the Edge of Forever and uses the Guardian of Forever to go back in time and kill the person who has been the biggest thorn in the Romulan's side and is crucial to the success of the Federation and Starfleet, James T. Kirk (Chris Pine)."
Spoiler Space
"Romulans from the future, most likely TNG time frame lead by a Romulan named Nero, played by Eric Bana, finds the City on the Edge of Forever and uses the Guardian of Forever to go back in time and kill the person who has been the biggest thorn in the Romulan's side and is crucial to the success of the Federation and Starfleet, James T. Kirk (Chris Pine)."