Someone very, very close to the 3G iPhone launch has told me that Apple will announce their new model at the WWDC Keynote on June 9th. The second-generation iPhone will be available worldwide right after the launch, and not at year's end, as previously thought. The new model will also herald new sales policies in some countries.
Gizmodo also claims that June 18th is the date for the launch of the iPhone in Spain. The iPhone is to be released at the grand opening of Telefonica's megastore—an Apple Store-like shop located in the company's historical building in Madrid's Gran Vía.