Earn BP Points, advance through the progress bar to new levels, and receive rewards! Read it on the portal
I do believe the information on the will be arriving later in the week. Friday, if I recall correctly.
The Battle Pass isn't time dependant. You can purchase it whenever you'd like to, if you'd like to purchase it at all.
The Summer Tokens should better explained later in the week.
I realize that the capstone reward is the most interesting part about the BattlePass because it changes, but even without the capstone reward you are still getting...
...for 2,500 Doubloons if you complete the BattlePass. The capstone is on top of all the above.
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