Arvidsson and Watson filed for Arbitration, which happens in early August. Unlike MLB where the arbiter comes up with a number, in the NHL it's either the teams number or the player's. If the arbiter decides on the player's number, the team can decline and the player is instantly a UFA. You can negotiate up until the hearing is complete.
Preds kind of screwed themselves with Johansen now that McDavid's extended, whereas the top salary in the league was 10.5 last week and now it's 12.5. He didn't file for arbitration, so he's probably shooting really high. That one might not get done until Traverse City.