Currently only language changes.
In current form, bitblik only supports BLIK payment system which is used mainly in Poland, although they are starting to enter slovak and portuguese market.
I would gladly expand bitblik to support other currencies and systems in other countries, the difficulty with that is that usually such payment systems require a residence or tax id in those countries which makes development and testing solutions for them a much harder task.
But slowly we'll work to get there.