Just looking at some Gifs and came across this one. He just started using the changeup in his last 2 or 3 starts. It's pretty impressive to say the least.

http://www.fangraphs.com/blogs/wp-content/uploads/2012/09/Dickey-CH-Whiff-to-Jones-in-8th-Slower.gif

The slow mo zoomed in version just looks ridiculous.

http://www.fangraphs.com/blogs/index.php/daily-notes-in-which-r-a-dickey-throws-a-changeup

Is his changeup faster than his knuckler?

That's just sick... he'll probably start throwing sidearm next.

Here is a closeup on his grip

https://twitter.com/ajd121/status/278267479392911362/photo/1