ASUS appears to have a successor for its P525 waiting in the wings. The yet-to-be-announced ASUS Pegasus just won a 2007 iF product design award. iF is a company offering design-related services. It has run the iF design awards since 1954.
Slimmer than the P525 at 15.4mm, the Pegasus Pocket PC phone also comes with GPS and a camera. The numeric keypad is complemented by a jog dial to allow for one-handed control. The device is finished with brushed aluminum and diamon-cut edges.
Aside from that, we know little so far. Hopefully we will find out more shortly.