Rumors of Linda Hamilton making an appearance in Terminator Salvation are now confirmed. She will offer a narration, not actually appear in the film.
/Film says:In February, Linda Hamilton revealed that she was in active negotiations to reprise her role as Sarah Connor for a voice over in McG’s Terminator Salvation. CHUD now has confirmation that she not only agreed to do the read, but the voice over is already cut into the beginning of the film.
I think this is fitting to have Hamilton doing the voiceover narration to the film. She was always making recordings and keeping a journal to help guide her son, so it is fitting that in a world long after Sarah Connor is on the Earth, we would see some sort of continued impact on John Connor’s life.
I really dig this . . . bringing Linda back (even if it's just her voice) well help tie back into the original films (something T3 lacked).