A new season has started! Enjoy!
This means everyone gets a fresh start at climbing the leaderboards. Since a new season is essentially a leaderboard reset it also means that the matchmaker won't know player skills for a while, so expect matchups to be all over the place for a few days.
Everyone has been reset to the default ranking of 10,000. Note that new players will still have a lower rating because anyone with less than 100 matches automatically gets reduced rating. So new players won't notice the reset as much as more experienced players.
This reset only influences your leaderboard rating. You'll keep any character and account progress you've made.