14 October 2010,
Here's the latest spoilers from Ausiello about the Firefly reunion between Adam Baldwin and Summer Glau;

Q: Hey! Where’s the Chuck scoop at?

A: It’s right here silly: The worlds of Chuck and Firefly will collide when Summer Glau guest stars as Greta next month. “We’re definitely going to get Casey [Adam Baldwin] and her to cross paths,” says exec producer Josh Schwartz, “so there will be a mini-Firefly reunion.”

Labels: NBC, Season 4, Spoilers, Summer Glau