Information Week reported that DoCoMo chances to win over Softbank and KDDI are getting bigger. Both DoCoMo and Softbank is using the WCDMA infrastructure instead of Edge/GSM which used in Europe but DoCoMo now has partnership with Google (a great partner of Apple in the US). On the other side, KDDI is using CDMA2000 infrastructure which hard for iPhone to adopt.
Via iPhoneworld