I don't think any country will create a fully public, P2P, blockchain-based cryptocurrency. Instead they will create currencies on blockchain platforms that are permissioned and that can be controlled.
japan already planning about this one thats why some of the japanese investors pullout their money in bitcoin because they want to have japanese coin.
Yeah I heard that news also, that why they've decided to regulate bitcoin to their country. Because of this, this one is the next thing for them to do and implement it to their country. If they want it to happen for real it will be like an altcoin digital currency also isn't right?