Yesterday it was the Nokia 900 Windows Phone, and today we have the Nokia 603 which is believed to be running Symbian Belle. We can call it a confirmed device as the details have been leaked from a user agent XML header file from Nokia.com itself.
The specs from the XML file say that the handset will have Symbian Belle, 360×640 resolution display, Wi-Fi, HSDPA, EDGE, and two soft keys (probably capacitive keys). Check out the full XML file over here.