The Google Nexus One spills keep on coming, and hot on the heels of leaked shots of the Android 2.1 smartphone in action comes an FCC filing with some juicy UMTS/HSDPA details. According to the filing, as well as quadband GSM/EDGE the Nexus One has support for both AT&T and T-Mobile 3G in the US, thanks to a triband 850/1700/1900 radio.
Update: Looks like things may not be so clean-cut as first believed. While the triband radio is listed, it apparently has support for the I, IV, and VIII bands but incorrectly includes AT&T 3G support in the VIII band. That means T-Mobile users in the US will be fine - together with European users - but AT&T support isn't yet confirmed.