I had to double check to see if that was the season finale because that was weak as hell.
Gus tease is was underwhelming, if it even was a Gus tease. Kinda stupid too, nobody else heard the horn? Mike parked at the perfect distance away so the sound carried only to him and Gus or Gus's men somehow knew this. They left a note so they don't want Mike dead, but setting off a guys horn in the middle of nowhere when he's trying to snipe a bunch of murderous cartel members is a great way to get someone killed.
Cliffhanger was stupid too. The tape brings nothing new to the table. It could be enough to ruin Jimmy's relationship with Kim, but Kim already knows. It could be enough to get Jimmy fired, except he works for himself. Chuck is literally a signature away from being committed to a mental hospital so his primary caregiver confessing to a crime while trying to talk him down from a complete mental break down doesn't seem like it would go very far. Unless Chuck gathers a mountain of evidence he's too far gone pose a threat to Jimmy. So that's what s3 will probably be about, Chuck making his case to take Jimmy down.