Fitbit's been in the fitness-tracking game for a while now, but today marks its first official entry into the wearable band space. Shown off here at CES 2013, the Flex is a wireless band much in the vein of Nike's Fuelband and Jawbone's rebooted Up. But while it shares many similarities with those existing products, there are a few very notable areas where it breaks apart from the pack-- namely, the inclusion of Bluetooth 4.0. Now, health nuts can wirelessly update their stats to an iPhone or limited selection of Android (!) devices via that standard without having to manu
