Just speculating here. But I have to think Alain Viganault and Rick Bowness being both available will be high on the list of Head Coach and Assistant Coaching candidates. They were both part of the Vancouver Stanley cup finalists team. So that point is certainly worth mentioning. DJ Smith seems to be the leading candidate from a rookie coaching persepective. Stevens also has had his share of ink, though to me it may be more as an Assistant. Other surprises may be Therrien. Now that Tippett is off the radar, and that Trotz has also indicated he would be open to returning to Washington.
Edit: Trotz has stepped down as Coach of Washington. He is free to pursue the Islanders job if he wants it and or Lou offers it to him.