Okay, here's a few of my thoughts from what I've read.
First of all...
Now that these new characters have had time to settle in, will the established cast make their return to the forefront?
McGill: Yes, definitely. I think you can say over the last twelve seasons we really got to know our long standing cast members and their characters: Nick, Sara, Greg, Brass, Doc Robbins. Introducing Russell, Morgan and Finlay last year required spending some time letting the audience get to know who they were, much in the same way as the early years. I hope that we’ve done a good job of letting the fans get to know Russell and Finlay, and I think that gives us the opportunity as we look at Season Thirteen to really once again focus on the whole team and really see them all playing together and interacting more.
Good. This is something I wanted to hear. I'm pretty sure the writers' version of "balanced screentime" is different to ours, but the first thirteen episodes of last season gives me confidence that they are capable of doing this.
Season premiere: I'm not sure I'm too excited about it. Granted, the episode tends to be better than the spoilers make it out to be but I feel like I've had enough of action-packed episodes. It sounds like the focus is on McKeen/Nick/Russell's granddaughter and I'm worried that the original murder in "Homecoming" is going to be left quite unresolved. I may need to watch the episode again but it felt so half-finished (compared to other first-of-two-parters) and I hope the writers remember to bring it full circle.
Ecklie's ex-wife: The fact that we won't see her in the premiere implies to me that Ecklie will pull through, it sounds like they want to do more with Ecklie. To be honest, I'm not bothered about meeting the ex-wife. Next.
Catherine return: I don't think she's been gone long enough that her return will make a big impact. If the show is renewed another year, we'll hit episode #300. Bring her back for that. If they cancel it (which I reckon will be quite unlikely) with prior warning she can come back for the finale. Although some references to her would be great.
Grissom return: See above.
Sara's mother: YES YES YES YES YES. That is all.
Femme fatales:
Annabeth Gish - no. That arc lasted long enough and it would be pretty meaningless without Catherine there.
Dita Von Teese - no. "A Kiss Before Frying" was hugely disappointing, mainly because the story was crap. Greg needs a good, emotional case, which isn't related to Old-Vegas, DVT wasn't bad but I wouldn't want her or that plotline to return.
Dina Meyer - of the three, yes, but I don't think "The List" was particularly memorable enough to spawn off a sequel episode. It would be a great Brass episode though which I'd more than welcome.
Other Episodes:
Diner shoot-out - sounds interesting. Could work well as one of the more comedic episodes if done right. I hope they don't extend this whole 'threaten the family' thing through the whole season.
Rat Pack Old Vegas - no problems with that, I like Old Vegas episodes.
Basketball episode - one sport they haven't investigated yet. :lol: Really don't like the idea of Charlie being a suspect though.
Genealogy episode - probably the most interesting on there. I loved "Genetic Disorder" and the fact that they're bringing Tina and Warrick into this makes me happy. I'd love if it were a Nick, Sara, Greg, Brass working the murder with the newcomers on their own case.
K9 episode - could be a fun one. "Dog Eat Dog" references?
Finn episode - Meh. I thought we'd resolved Finn's Seattle firing issue. Apparently not. So long as it brings some proper closure.
Miami characters: No thanks.