Either the 3rd movie or the tv series better show how they got the Terminator's looking like Arnie, Loken and Patrick. The back story is that they were captured soldiers and stripped of their skin to be cloned onto the Terminators. A camero for those actors will be nice in that sense.

But, I will be very happy of the 3rd movie Terminator will be Loken. A captured one and preprogrammed just like what happened in T2.