I'm not a huge Chuck fan but I've see this casting news that might interest you :
http://www.hollywoodreporter.com/live-feed/comic-con-2011-mark-hamill-214629
Spoiler Alert :
The Chuck panel at San Diego Comic-Con Friday made a big announcement. Star Wars legend Mark Hamill has been cast as the first villain of Season 5. He’ll appear in the season premiere on Friday, Oct. 21 at 8 p.m.
BTW this guy is old but still awesome.