After a premature reveal on Wednesday, Sony Ericsson today officially took the wraps from one of the first phones to provide HD video capture in a US-ready form. The Vivaz is now known to include North American 850MHz 3G and will let those on AT&T, Rogers and others record 720p video they can then push to Picasa or YouTube. In a small tweak to Apple, Sony Ericsson also touts that its uploads will work in the background, although full 720p detail will need to go over Wi-Fi due to battery worries.