Apple team has declared the next iPhone firmware, iPhone 3.0 at recent Macworld Expo. They have already released two Beta versions of the new firmware and now we have iPhone 3.0 Beta 3 firmware, which is exclusively available for official developers and registered members.
The iPhone 3.0 Beta 3 has improved in navigation speed as well as device performance. The build number of the latest firmware is 7A280f. As of now there is no other detail information available about this firmware.