He's a smart businessman, I doubt he'd purchase the company if it was hamstrung by the same bad union contracts that are partly to blame for bringing down GM.
I am really glad that Saturn got out from under GM. I hope that Penske can return them to what they were 5-10 years ago. They and Pontiac were the best lines of cars that GM had and they were being flushed down the toilet. That decision just didn't make sense to me. I'm going to guess that eventually GM will discontinue all car sales and focus on their GMC truck and SUV lines.
He may have the Renault people build the new Saturns after the two factories close. He wanted to protect the manufacturing of the engine supposedly.