So really... what is ADV 5? Here are the facts:
Set Size: ??? in Japan, ??? in the US
Chances are that this set will have 53 cards in it as well.
Set Order: 23rd set in Japan, ??th set in the US
Release Date: ??? in Japan, ??? in the US.
No info has been released about this set, other than that it will be released.
The symbol for ADV 5 is.... [shrugs]