All Auctions listed when next week’s maintenance begins will be cancelled and returned to players’ mailboxes.
(Source)
To prepare for the upcoming region-wide commodities Auction House update, all auctions that are still listed when next week’s maintenance begins will be cancelled and returned to players’ mailboxes. There will be a notice that appears in the Auction House 48 hours before the maintenance begins informing players of the update, so be sure to set your listings to end before the servers go down.
