Well, last night's season finale was interesting. All that setup and Mike doesn't fire a shot at anyone. I was also a bit surprised that Jimmy fell for Chuck's set up at the end, though he really does love his brother to the extent that he'll risk everything for him.
Now we have to wait until next year to see what happens...
Those of you who watched Talking Saul know about the episode titles easter egg - the first letters from season 2 are an anagram for "Fring's back." Vince Gilligan acknowledged this, and I don't think he was purposely being misleading. So if it was Gus or one of his people who left the note on Mike's windshield, maybe that's where the connection begins.
Now we have to wait until next year to see what happens...