Hits: a hit is a knock-out or bust-out. If player A busts-out player B, player A gets a "hit".
Points for Playing: a formulaic way to award Points to your players.
Previously, the Stats tab had a Score column that could only display the choice of one of two built-in formulas. Now, you can create your own formulas for scoring players, independently of a player's Points.
So, if you just want to score players (or rank, or whatever you want to call it - compare players to each other) based on the sum or the average of their Points, you can just use the built-in summing and averaging of the Points column on the Stats tab.
But if you want to do something more complex, you can use the Tournament Scoring and Overall Scoring formulas of the Stats filter.
It works like this: You create a Tournament Scoring formula. This formula is applied to each player, for each tournament, to arrive at a Score for that player for that tournament. Then, you create an Overall Scoring formula, which takes those Scores for a player and computes an Overall Score for the player.
Why have a Points for Playing formula and a Tournament Scoring formula? Because having a different formula on the Stats tab allows you to be more flexible. If you are awarding Points to players, you may wish to score the players differently.
As [just] an example, points could be awarded to players during a season that eventually allows a player to enter a "final tournament" at the end of your season. A player who earns enough points gets free entry into the tournament. But points may not reflect how the player should be ranked against other players (maybe you're awarding points for buy-ins, rebuys, and add-ons, so that if a player has spent enough money during the season, they get free entry). So to rank the players, you may use a different method. Apply this method to the Tournament Scoring formula and the Overall Scoring formula (perhaps it is based on finishing place and number of players in the tournament), and you'll get your ranking system that is independent of how you awarded points to the players.