Well, we know the 2nd season would've had new characters and all the main characters are in school. But do you think would've happened and what mysteries would've been set. Okay here is my analysis.
Mystery: Well, we only had a few questions unanswered. Why did Skip kill Greta's mom? And HOW did he do it? I think Johnny would've kept the real murderer a secret because Skip promised to be there for Greta and she was happy about it and he didn't want to take that away. In the end, we find out that Greta's mom wasn't so peachy and he had a legit reason to kill her(if she's really dead). I also think another murder would've taken place. Either in the school or in Hidden Palms. The murderer would've been a new character.
Drama/Red Herrings: Well, there would've been quite a few red herrings, I believe. First, I believe Nikki would've felt back into her drinking habits at some point. I also believe some chick in school would be playing the jealous role at Cliff becoming a one-woman man and not paying her any attention.
Johnny and Greta are gonna go through the motions because he's holding a huge secret. I also see some Johnny/Liza action after a Johnny/Greta break-up. History repeats itself just like with Greta/Eddie/Liza.
Liza. I always picture her having a boyfriend back at school who she doesn't really like(for various reasons, one being Eddie/Johnny). I also pictured her getting a F on a test and so she has sex with the teacher to get a better grade.
Anyway, that's my idea of season 2. I REALLY wish I knew what Kevin had in mind for season 2. Damn The CW!