Cave's Yukihiro Masaki announced that the iPhone port of EspGaluda II will be available worldwide on the App Store on April 10, for a promotional $4.99/3.99 Euro/￡2.99 price. If you're not sure about playing a hardcore shooter on the phone, there will also be a "Lite" version available for free.
EspGaluda II is the same game whose Xbox 360 version was released region-free as an experiment. It would appear the company is still experimenting! See a trailer after the break.