As you may know(if you own a recent Apple product), iOS 8.2 is available for download today(March 9). This update contains code for Apple Watch support(as the smartwatch is being released on April 24th), better stability and bug fixes.
As for the Watch, it will support third-party apps from the likes of Instagram and Uber. Nothing on any games so far. Also, the price of the Apple Watch Edition(made from 18-karat gold)will quickly demolish your wallet, as it costs $10,000. Yeah.