We first heard about the existence of the Acer M310 Windows Phone last week, but literally no information was given besides the fact that two test units were discovered on a developer's traffic sheet. How about a few more shreds of meat to chew on? According to WindowsPhoneNZ, the Mango device was sighted at TechEd New Zealand with HDMI-out support. We may be seeing this feature across a large variety of Windows Phones coming out this fall, as the HTC Eternity
