Shero probably doesn't make any coaching changes in the middle of the season, unless some interesting names gets fired. I count among them Jack Capuano, Dan Bylsma, Jon Cooper, and Claude Julien in the east, and Lindy Ruff, and Paul Maurice in the west. Cooper is the only coach who gets me excited, but I think it's very unlikely he gets fired. Because of their old relationship, Shero might be interested in Bylsma's services, but choosing him would be a big mistake.
However, I think it is more likely that Shero will change coaching staff after this season, or he might even give Hynes a second chance and watch how Devils plays their first 10–15 games before he makes any decisions.
I'm also sure that there will be some roster moves before trade deadline and after the season. Maybe some desperate teams wants to add Parenteau, Quincey, or Fiddler in their group, and we get few middle round draft picks. I would also consider to trade Henrique or Cammalleri, although many HFers have forgotten that especially Henrique might be better next year. Tuukka Rask and Jakub Voracek are great examples of players who have had bounce-back years after one or more mediocre seasons.