You may remember that a couple of days ago, the Diablo III auction house went down for a time due to a gold duplication bug that was being rampantly exploited by players. Thankfully, a patch was deployed in a nice, timely manner, and everything ended up all right.
Or did it? Rather than performing a server rollback, which would set all Diablo III players back, Blizzard has decided to perform a complete audit of the transactions made on the auction house in order to find players guilty of utilizing the gold duplication exploit. Unfortunately, Blizz was a bit conservative in its estimate of how long the auction house would be down. While there's currently no new ETA for the auction house's return, a post by Blizzard CM Lylirra states that the studio anticipates the AH being down for "at least another 24 hours" while the audits are in progress.