We can't say we haven't seen the BlackBerry A10 before (http://www.gsmarena.com/image_of_blackberry_a10_with_5inch_display_leaks-news-6366.php), but seeing it in action on video is a new ballgame altogether.
The video comes straight from Vietnam, courtesy of a mobile accessory shop, called Vivix (https://www.facebook.com/vivix.vn). So far we don't have much details about the device itself.
Via (http://crackberry.com/hot-blackberry-a10-shows-video)
GSMArena.com