"An official representative of Michael Biehn and Blanc-Biehn Productions has informed us:
“He has never heard of the remake or been contacted”
In regard to Biehn and Hamilton returning in the next Terminator movie:
“The return of Michael Biehn and Linda Hamilton in the next Terminator movie were just rumors in the first place, but if they are making it and leaked that he may be doing it with Linda (the reboot), then these were just rumors to him as he has never even spoke to anyone.”
I never expected that he would be in the movie but I guess anything is possible with time travel.