Ah, the BlackJack. Samsung’s long-standing smartphone family has grown another, but the newest member has dropped the “Black” and stuck strictly with “Jack.” Launching today exclusively on AT&T in the US, the Jack features Windows Mobile 6.1, 3G connectivity, a sleek keyboard and support for instant messaging and access to multiple e-mail accounts. Samsung makes known that the Jack will be upgradable to Windows Mobile 6.5, and as for hard specifications, we’re looking at 256MB of RAM, a 3.2MP camera, video-capture