Although Italy saw a sort of stealth release of Magikarp Jump last week, it's coming to more markets soon, including Japan as of tomorrow. Both Android and iOS will have its own versions, which feature the titular Pokemon in fishing form. It's free-to-play with microtransactions, if you were curious.
Evidently further information on future regions will come in time, and my guess is that we'll probably see it in every major region within a month. As for the game...it looks, okay? Given that not many people have played it we really don't have a lot of reports in regards to the fairness of its pricing scheme, but I'll be giving it a shot.
Anything for Magikarp.