Remember our little info regarding the Z770i? Seems the video is not taken by the mobile itself. Today a whole lot of these test_xxxx.mp4 vids popped out of nowhere into Fun & Downloads. You know, a pic says more than thousand words. See the full sheet with known phones greened out after the jump.
Full pic here.
The Unofficial Sony Ericsson Blog 
huhuhu, that what i saw when i visit the fun and download page. lol