One of the great things I found with the premiere, was the way Grissom and Sara behaved around eachother. They've always had such great chemistry, but in their scenes together here you could really see the change in their relationship. There was more fluffiness to them, their interactions were evident of two people who are involved, and don't just have a burning attraction between them. That was great, so well played by WP and Jorja. Grissom himself has really softened when he's around her, if you compare his tone of voice and body language etc in the "veggie burger" scene to the way it is in, for example, the scene from "Butterflied" when he's talking to the Doctor/Suspect towards the end, it's so different, there's less reluctance on his part to show feelings for her. I doubt that they're going to be able to hide the relationship for much longer, anyone watching them together, is going to start spotting the signs. Even Warrick seemed to be studying them and trying to suss them out in that one scene.
Should be very interesting. I've done the best I can to stay away from Spoilers, so am very keen to see what happens, as I have no real clue right now.