This information was announced by Google at VidCon 2014 online video conference taking place. Accordingly, YouTube will support videos posted at 48fps frame rate and the highest at 60fps, perfect for video game clips.
Videos with a speed of 60fps are still quite few on YouTube, most of them are game trailers but through experience I find it to be especially effective with fast footage and many effects. 60fps speed makes motion, the effect in video becomes smoother and more impressive. I have 3 videos below, which are shot with 60fps for you to watch, remember to choose Full-HD resolution for the highest experience.