i have preordered this
i loved ken's rage part 1 - loads of violence
'treasure boxes' in general are quite limited, usually only for japanese releases
not extremely, but once they are gone, they are very hard to find.
although can't say the value may increase, as this series isnt extremely popular outside of japan
this game is probably like the first one, everything in japanese, but im happy to say the NA/EU version will be out 5 Feb (no CE or limited editions though, just the game)