A few head-scratchers: Marchessault, Jagr, Mrazek, Vatanen left unprotected. Pysik, Howard, Bieksa, Reaves protected by their respective teams.
Vegas won't be a 70 game loser. Parity rules.
Other unprotected players are those who their team expects to lose in free agency anyway. Jagr, for example, has been playing under one-year contracts over the last few years -- and he'll be a free agent on July 1st, so Florida stands a good chance of losing him to another team anyway.
Something else to keep in mind is that any player who has a no-movement clause in his contract MUST be protected in the expansion draft unless he agrees to waive that clause (like in the case of Marc-Andre Fleury of the Penguins).