MacRumors is reporting that The Wall Street Journal has updated their previous story about Apple working on smaller iPhone, by adding new details. According to their report, the new smaller iPhone which Apple is rumored to be working on will sport an edge-to-edge touch-screen display, along with voice based navigation for Maps.

The person who saw the prototype of the new iPhone said the device was significantly lighter than the iPhone 4 and had an edge-to-edge screen that could be manipulated by touch, as well as a virtual keyboard and voice-based navigation. The person said Apple, based in Cupertino, Calif., also plans to upgrade the iPhone 4.