The next version of Apple's wildly popular iPhone, which may be released as early as next month, will use third generation wireless (3G) high speed data transmission (in addition to WiFi capability when a WiFi signal is available, just like the current iPhone), will likely have a more rounded shape, and a black case is rumored. The original iPhone didn't have GPS capability, nor did it provide an easy way for other companies to link an add-on GPS device.
That seems likely to change with the new iPhone. GPS has long been rumored for the next iPhone, but more tangible evidence surfaced recently in the software development kit (SDK) that is provided to programmers by Apple. The SDK for the new iPhone includes multiple references to GPS, and names standard GPS data exchange protocols. It also appears that GPS in the iPhone may be used to attach GPS data (geotag) to photos taken by the device. I'm a fan of the iPhone and iPod Touch, so I hope Apple adds GPS to these already outstanding devices.