We can expect it to basically be a token pegged to their fiat(Yen). I doubt we will see it being proof of work or proof of stake and will succeed based on which vendors choose to accept it and whether people trust it, which they definitely should not if it is centralized and not open source. It will be less of a cryptocurrency like BTC or Steem, but rather just a way for people to convert their Yen into a digital token for transactions.