According to Ask Ausiello, we'll be having some fannish alums showing up on Sarah Connor in the near future. (spoilers)

In answer to a general request for spoilers, Ausiello spilled that,

"Former West Winger Richard Schiff will appear in episode 10 as someone who may or may not have come from the future to help the Terminators.

Buffy alum Adam Busch (a.k.a. the bastard that killed Tara!) is also in the episode, but I can't say who he's playing. Too spoilery."

Well, since Tara isn't in this show, my guess is he'll be killing which ever character is supposed to die in the near future, or not. 

Sources

Ask Ausiello