NBC isn't saying anything official, but since all the rumors about the show have been positive lately, it's definitely a good sign for Chuck's vocal supporters.
Chuck fans rejoice, NBC may want 6 MORE episodes
The rumors get better and better for Chuck fans. First came word that NBC might start airing episodes this fall rather than next March (although October seems out the window at this point). Now the network supposedly wants to increase the number of Chuck episodes it has on order from 13 to 19. According to TheWrap, two "industry insiders familiar with the situation" tipped them off to NBC's plans. They also speculated that Chuck might return sooner than March, although they put the early arrival in January rather than the fall.