As you can see from my screen shot the update is being pushed out now. Be sure to let us know when you see it in your area.
Be expecting the update at around 2PM Eastern time, thanks @MichaelClewley for the heads up! Check your device for software updates and let us know in the comments below if you have received your update. T-Mobile customers only. If you are not a T-Mobile customer you could download OS 10.2.1.2228 here.