Softbank (SFTBF), Japan’s No. 3 wireless provider, broke the news in a spartan press release that would do even Apple (AAPL), a company renowned for its minimalist gadgets, proud. If ever there was a one-button press release, this is it:

SOFTBANK MOBILE Corp. today announced it has signed an agreement with Apple® to bring the iPhone™ to Japan later this year.”

Well, there you go. Presumably, Jobs will fill us in on the details on Monday. In any event, lining up a wireless partner in Japan is an important step for Apple, which hopes to gain a 1% share of the global cellphone business by the end of 2008. Nomura Research Institute estimates that Apple can sell 2 million to 3 million iPhones annually in Japan–-about 5% of the market–if it plays its cards right.

Also announced this morning, a deal with Telefonica (TEM), which has agreed to distribute the iPhone in Spain through its Movistar subsidiary. Together the two deals bring the iPhone distributor count up to an even 70, with more countries presumably waiting in the wings.

(Image credit: AAPLinvestors)

The device is largely as expected–an iPhonish-looking thing with both GPS and Wi-Fi, 1GB of permanent flash memory, a 2-megapixel camera, full HTML browsing, 3G support on GSM networks with HSDPA access and, of course, the BlackBerry’s one-trick killer app: instant, secure email. That’s a compelling combination for business users and casual ones not easily swayed by the iPhone’s hype juggernaut as well. Indeed, Citigroup analyst Jim Suva says it could boost RIM’s quarterly shipments by 200,000 to 400,000.

But perhaps not without a bit of struggle. The BlackBerry Bold won’t ship until as late as August, which means Apple (AAPL) could beat it to market with the enterprise-friendly 3G iPhone it’s rumored to be uncrating at its Worldwide Developer’s Conference in June. Which has got to worry RIM. After all, the first-generation iPhone had claimed a 28% market share by the fourth quarter of 2007. That’s still less than the BlackBerry, which holds about a 41% market share, but the iPhone hasn’t even been on the market a year.

Last Friday, Digg founder Kevin Rose, whose “Diggnation” videocast has become a sort of Psychic Friends Network for Apple rumors, claimed the next-generation iPhone would include two cameras and support for video chat. A few days later he added that the device will also run on a faster 3G network, include GPS and ship in June.

Now Gartner Group analyst Ken Delaney has joined in the handicapping, speculating that the device will boast an organic light-emitting diode display that will make it thinner and reduce power consumption. Delaney says the iPhone’s somewhat disappointing performance in Europe has forced Apple’s hand, inspiring it to fast-track the 3G phone and place an order for 10 million of the devices from its manufacturing partners in Asia.

Could it be that Apple is planning to announce the 3G iPhone at WWDC, with an eye toward an official release on June 29, the first anniversary of its predecessor’s debut?