Confirmed that the price of gold is going to a minimum $0.25/million in the patch tomorrow.
General Improvements:
Players can now cancel their auctions at any point so long they do not have any active bids on them (it will still take five minutes for a listed auction to become searchable, however).
We've increased the maximum stack size of gold per listing from 100,000 to 1,000,000. The minimum listing price will remain at $0.25 per stack.
We've added description text to several error messages. We've also improved several existing descriptions so that they more clearly describe why you've encountered an error.