20 September 2010,
TVGuide.com had an interview with Chuck creators Josh Schwartz & Chris Fedak. Read the interview highlights below: BEWARE SPOILERS!

TVGuide: If before the show was about Chuck trying to be a man, and then Chuck trying to be a spy, now what is Chuck trying to be?

Chris Fedak: This season is Chuck trying to find his mom. That's the mythology, that's the big search of this season. At the end of last year, his father gave him a quest, a big mission, and that was to find Mama Bartowski [Linda Hamilton] and figure out what had happened to her. It's a big dynamic shift for the show this year.
 
TVGuide.com: Is Awesome going to be pulled back into the spy world this year?

Schwartz: Awesome has his hands full.
Fedak: With Ellie now pregnant, Awesome pretty much comes to the realization that he's going to be the best father that ever existed, even if she's only three months' pregnant. He's totally focused in the beginning of the season on the future baby. - Full Interview

Labels: Chris Fedak, Josh Schwartz, Season 4, Spoilers