A mere six months after the introduction of the Galaxy Gear, Samsung is returning to the smartwatch market with two new models: the Gear 2 and Gear 2 Neo. The disappearance of the Galaxy branding is indicative of the biggest change: Android has been replaced by Tizen as the operating system on Samsungs smartwatches. The Korean company doesnt detail why its making the switch — nor what it will mean for app compatibility between the first- and second-generation platforms — but it does say that the Gear 2 and Gear 2 Neo will be compatible with dozens of Samsung devices right from launch. Thats not as broad as Sonys SmartWatch 2, which works with any Android 4.0 device, but its a significant step up from what the Galaxy Gear initially offered.