The October 2020 game update for Magic: The Gathering Arena was scheduled for Oct. 14, according to the State of the Game blog, but it has been postponed until next week, on Thurs. Oct 22 due to technical issues. The Festival events have also been delayed by a week, but other events, including the Arena Open, remains the same.
Here are the chanes to the MTG Arena maintenance schedule:
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The latest State of the Game blog also confirmed the release of the upcoming remastered set, Kaladesh Remastered.