The Japanese Monster pack was inspired by 1950's-1970's Japanese monster movies (Godzilla..)
The models used for the pack are 1 Clyde, 1 Mid, 2 First Rounds and 1 Stepper.

After emailing Puma and www.thegoodwillout.com , I found out that they will drop MId/End of March.
Each shoe will cost 199 Euro, which at the moment is $249. To you lucky bastards fortunate enough to get a pair, they will be available online and they do ship the the US.