OK from what I've heard, not sure how accurate these things are... but the episode following Sara's departure will really focus on Grissom and the rest of the team dealing with this, quizzing him over where she's gone and when/if she'll be back and we'll find out more about what brought this decision on, there is also rumor going around that there will be a phonecall between Sara and Grissom at some point within the next few eps following her departure... but apart from that I don't know what the call will be about, who will phone who, where or why... but that's what's on the rumor mill at the moment. there also seems to be the consensus that Sara will make her first guest appearance since leaving sometime in the early 8x20's, again the details I don't know, but it's also going around that she will also be in the finale. Again I am not 100% on this but there is also rumor going about that Sara will be returning to the lab and that Grissom will make reference to her being back home and being a lot better (quite when this is supposed to happen I don't know), we just wont see her. I really wish I had something a little more concrete - there is so much flying about at the moment I really don't know what's true spoiler and what's just been generated on the rumor mill - but that's what's going about at the mo!