The Diablo 3 Auction House will be taken out and filled with lead in less than a day. Come 3AM PST, it will cease to exist, consigned to the abyss from whence it came. The event will probably be marked by a celebration in the streets, but mainly because it will coincide with scheduled maintenance for American players, so what else is there to do?
Blizzard has updated the FAQ, explaining exactly how the dismantling of the Auction House will affect players.
If you have an active auction going on when it shuts down, they will expire as normal. Items will be delivered to the highest bidder or back to the seller, and both gold and items will be accessible from the completed tab until June 24th.
The Auction House will actually remain in a diminished format until that date, but from 3AM PST on March 18th, you won’t be able to bid, buyout or list new items.
Additionally, your Battle.net balance will be unaffected, and you’ll still be able to use it to purchase games and services from the Blizzard shop as you normally would.
So this is your last chance to spend gold in the Auction House. Make the most of it. Or don't.