Any guesses for what will happen in season 3 of 90210?

i know 90210 doesnt start back up until september 13th or something but any guesses as to what will happen in season 3? i would love to hear different opinions on it. or any comments about the season 2 finale! also does anyone know why ethan (dustin milligan) left the show after only one season? i liked him but i do admit theres more drama and its better now that hes gone. thanks!