Patch notes can be found here:
Patch Notes 6.5.5. - Mirror World and 7th Anniversary Event
[Spirit of Tempest Height] The radius of the area in which the treasure chests are generated, when the monsters die, was increased by 100 % to resolve the issue of the treasure chests overlapping each other when there are too many of them.
Thanks for this one! Was such a pain in the butt previously..
[Auction House] Players will be now allowed to set up the price of items up to 999.999.999 gold.
Wasn't this allowed before? Could have sworn I saw peeps put items in AH for fun at max gold amounts previously.
Can't wait to see what this Mirror World looks like.