There have been doubts that Lenovo's ThinkPad Helix would ever arrive in the US, with even the past FCC appearance of a WiFi-only version offering no guarantees. An American launch now seems considerably more likely in the wake of a follow-up FCC approval. The dockable, 11.6-inch Windows 8 tablet has popped up carrying LTE both on an AT&T-specific 700MHz band and AT&T-friendly AWS (1,700MHz and 2,100MHz) bands -- with such explicit network suppor
