Engadget reports that a version of the new 3G iPhone's firmware has been released, possibly for testing by carrier partners. Combing through the raw data, they've uncovered the following hardware details:

• Infineon PMB6952 / S-GOLD3 six-band UMTS / HSDPA transceiver
• Murata LMRX3JCA-479 tri-band amplifier (we're assuming for the 3G)
• Sony SP9T antenna switch for GSM / UMTS dual mode
• ARM 1176JZF-S - Main CPU (same as in 1st gen iPhone)
• Skyworks 77427 chip - UMTS / HSDPA tx 1900MHz, rx 2100MHz
• Skyworks 77414 chip - UMTS / HSDPA 1900MHz
• Skyworks 77413 chip - UMTS / HSDPA 850MHz
• Internal build model number: n82ap (1st gen iPhone was model m68ap)
• UMTS Power Saving option - on or off
• Hooks for Global Locate Library (GLL), software that handles A-GPS related commands for the host processor

One of the major things here is the inclusion of quad-band GSM support, A-GPS, and tri-band UMTS / HSPDA. This would make the second generation iPhone 3G-capable pretty much anywhere in the world.

Of course, these aren't officially confirmed yet. While we all wait for the official word from Apple (the launch will reportedly be on June 9), you may want to look through these leaked images of the new iPhone, courtesy of CrunchGear.