From [Sci Fi Wire](http://www.scifi.com/scifiwire/:)

Nick Stahl, who played John Connor in 2003’s hit Terminator 3:
Rise of the Machines, told SCIFI Wire that neither he nor T3 co-star Claire Danes will appear in a proposed fourth Terminator movie.

Interesting. I wonder what the plot is. Neither of them will be a particular loss, but where will the franchise go? Arnie is getting a little long in the tooth to carry it again.