The Plague Quarter will open at the following times per region:
Americas: Tuesday, July 29th at 11:59 PM PDT
Europe: Tuesday, July 29th at 11:59 PM CEST
Korea/Taiwan: Wednesday , July 30th at 12:59 AM KST / Tuesday, July 29th 11:59 PM CST
China: Tuesday, July 29th at 11:59 PM CST
(Americas Region) The cards that players can acquire in The Plague Quarter will be featured on the official Hearthstone blog here once The Plague Quarter is live in the Americas region.
Good luck and have fun acquiring new cards for your Hearthstone collection!