More Evo item questions... not about specific items

Have we figured out yet the difference between the item box types? e.g. The blue-ish sparkly one as opposed to the normal gold/red one...

Does every character have a total of 6 win poses to buy at the shop?

Are the criteria for increasing rank still the same?

I tried a search, so i'm sorry if these have been answered elsewhere.

Regards,
Aeon