Today was the deadline for players to opt to file for Salary Arbitration. Once a player files for arbitration they are no longer eligible to sign an offer sheet with any other team in the league. If a player chooses to not opt for arbitration they are still able to field offer sheets.
This list of players who filed today is a long one:
With players like Tkachuk and Dubois not applying for arbitration it will be interesting to see how their situations end up as both players are highly sought after.