OK, so first and foremost, while there's a few tidbits out there, but still not much, there's still nothing to take as gospel.
What comes to mind to me is that while Peyton isn't mentioned it does not mean she is not on the show, or will not remain a figure in Mac's life, even if only thru allusions in conversation. Personally, I choose to believe she'll be back if only because of the work they put into evolving a relationship for him in S3, and because he chose to go with her to London in the end.
Next thing that comes to mind is the interview with Claire Forlani wherein she is said to have taken a movie role, which may overlap in filming with the early-season episodes. She may not have been available to shoot the first shows for S4.
It may also be that they are only leaking what they perceive to be major plot bits, instead of continuity ones (like injuries and lab clean up).
It's still early days yet, but I'm glad to hear that Stella, Hawkes and Danny are getting what sound to be juicy bits to tackle. Glad Sid and Adam are returning. I hope they bring Peyton back too. I like her and what she brings to the show.
As I said, there's still no mention of how Danny and Adam have healed up... so we'll see how the continuity fairies are doing, as with the rebuilding of the lab. How I feel about Mac losing it on a suspect depends on the context in which it happens, and I guess there's no dirt on that yet.
So, while I love spoilers, they only give me more questions, they don't really answer a whole lot. Thanks for everything so far, I'm looking forward to more...
