Today DJI announced the new OSMO Mobile Gimbal for Smartphones. Yes, there are already plenty of existing smartphone gimbals on the market, but what makes the OSMO Mobile different is the way the gimbal interacts with the smartphone via the DJI GO app.
A few features are Face Tracking to automatically pan and tilt the gimbal, work as a Motorized Pan Tilt head for motion timelapse, and even Live Stream to YouTube and Facebook from within the app. As far as Smartphone Gimbals go, I think they just stole the show. There's a list of other features for the OSMO Mobile available now at the DJI Website (found here).