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About ten minutes ago, Blizzard put up a notice in their client and on the web stating that due to a bug "currently under investigation, DVa is temporarily disabled in all regions."
#Overwatch Due to a bug currently under investigation, DVa is temporarily disabled in all regions. Thank you for your patience!

There is no ETA on when this issue will be resolved. It must be something incredibly severe to resort to totally disable a character in the game.