The major Rocket League Progression Update changed up a whole lot when it comes to how the game's, well, progression works. Here's a short primer on Weekly Wins.
No, no, that is not a typo.
Featuring some impressively long patch notes, and a substantial progression revamp.
Psyonix have come out and published information on what the odds are of you getting an Exotic skin (hint: it's not phenomenal).