Acer has their W4 Windows Phone on display at Computex 2011. A close look at the placard reveals a November 2011 release. This will ship with Mango, but our eagle eyes cannot make much more from the tiny text.
3.6-inch WVGA
Screen Resolution: 480×800
5mp Camera with auto-focus
HSPA 850/1900 or 900/2100 /GSM quad band 850/900/ 1800/ 1900 MHz Support
Qualcomm MSM8255 running at 1GHz
Wifi, Bluetooth 2.1
DLNA Support (DMC)
Windows Phone Mango
8GB Storage
Acer’s W4 specifications:
3.6-inch WVGA
Screen Resolution: 480×800
5mp Camera with auto-focus
HSPA 850/1900 or 900/2100 /GSM quad band 850/900/ 1800/ 1900 MHz Support
Qualcomm MSM8255 running at 1GHz
Wifi, Bluetooth 2.1
DLNA Support (DMC)
Windows Phone Mango
8GB Storage