It seems like everybody's getting into the 3G tablet game these days, especially on AT&T: Samsung, HTC, Acer and even Pantech have all released models within the last 6 months. But so far, Sony hasn't seemed all that interested in anything but WiFi for its Tablet S, at least in the United States - back home in Japan, 3G models of both the Tablet S and Tablet P are available.  According to a recently leaked roadmap, that may soon change, with a new Sony tablet code-named the Crystal.