Same story, different Carrier/Country. Softbank announces that they will carry the 3G iPhone on their UMTS 3G Network later this year
"この度、ソフトバンクモバイル株式会社は、今年中に日本国内において「iPhone」を発売することにつきまして、アップル社と契約を締結したことを発表いたします"
Since they don't mention exclusivity, NTT Docomo, KDDI and the rest still have a shot - so don't go dropping your current provider just yet!