Actually, I did think that Gris & Cath had a little something something going on (when I was still watching LV anyway) and now, well, GSR is canon, so like I said, you never know about these things *shrugs*
Honestly, I don't think Peyton will be anything beyond Mac's girlfriend the way she was forced down on our throats (my throat, anyway). I just see her as a conduit so we can see Mac's more human side. She's hardly reacted with the rest of the team (never seen her with Danny nor Lindsay in the morgue for that matter).
I'm curious, for those who want Peyton to stay, which direction would you like to see her go? Be a regular castmember? A recurring guest-star like Det. Angell but not in a relationship with Mac or just stay with the current status quo?