Many actors in current "bubble" shows audition for and get picked up in new shows and have a clause in the contract [with the new show] that lets them go back to the original show if that original show is renewed. The role in the new show is then recast if the pilot is picked up as a series...
At least one actor from Tera Nova has been cast in a new pilot for next season. While not an absolute indicator, it does put doubt on the series coming back.
So having an actor from Terra Nova appear in a pilot doesn't necessarily mean the end of Terra Nova, even if it's a principal actor. It just means the actor is smart and has a smart agent.
Edited by Drew2k, 05 March 2012 - 06:03 PM.