We just don't fucking know.
I haven't watched much of season three yet, but I knew they killed off Erica. Not sure I really want to watch now that they killed of Boyd. I'm kind of pissed, to be quite honest.
Also I don't give a fuck about any of the new characters so far, and since I'd be perfectly happy to see the group dynamics of the Beacon Hills bunch (ie Scott's "pack" plus Derek plus Isaac plus parents and also Danny), I feel like they're throwing everything in there and it's too much.