We have noticed that the Wednesday Arena and Thursday Arena have been released after the update implemented on 8/25 (Wed). These dungeons were a part of the All-Days Arena, which includes dungeons that are available on certain days of the week, and were originally scheduled for release starting 8/30 (Mon).
Both the Wednesday Arena and Thursday Arena which were prematurely released have been tested to play as intended. The dungeons will continue to be available to play.
Additionally, please note that the All-Days Arena for 8/27 (Fri) - 8/29 (Sun) will not be available to play.
Please see here for more information on the All-Days Arena: https://bit.ly/2UPppCW
We apologize for any inconvenience this has caused.
Thank you for your patience and for playing Puzzle & Dragons.