I hope we get a new arc for Nacho
Based on the first episode it suggest BCS is continuing with Nacho's story arc revolving around the suspense of him secretly conspiring against his associates out of self preservation (First Tuco then Hector). We the viewers have to expect there is a high probability that he is eventually going to be killed (or Disappeared) since he is nowhere to be seen in Breaking Bad and is only briefly mentioned once is passing.
It seems this season he will have to deal with Gus who noticed his switching of pills and later had him followed & watched when he was disposing of the evidence.