The Asus E600 is a slick looking device, so the company has evidently decided to go ahead with it, prepping it for commercial launch. It will most probably appear on the "premier carrier" for Windows Phone 7 devices AT&T, since we saw it with the 850/1900 MHz bands a while ago at the FCC, when it was still Garmin-Asus E600.
Our rough calculations, based on the FCC ruler markings, peg the screen around 4" in diagonal. The phone also features a 5MP camera with LED flash on the back, and a 1300mAh battery. The chassis seems to include brushed metal parts, and the handset is fairly thin, but not Samsung Focus thin. There are a volume rocker and camera key on the right-hand side, a microUSB port on the left, and a lock/power key plus a 3.5mm audio jack at the top.
When the Taiwanese announced they will exit the Garmin-Asus joint venture earlier this year, they calrified that the company will be working both on Android and Windows Phone 7 devices. The funny part in the new photos in the FCC filing, that were submitted on Saturday, is that the charger and headphones still carry the Garmin-Asus branding. We were scouring the quick user manual for any indication if Asus has included its own apps for DLNA streaming, or something similar that will further distinguish the phone, but we didn't see anything out of the ordinary for a Windows Phone 7 handset.
Below is a video of the Asus E600 in action, back in the days when it was used by Microsoft's developers for testing WP7.