Designed for pros?

It mostly seems to be a design change - The cord connecting it to the Wii remote is now on the top instead of the bottom, there are now two grips to make holding the controller slightly easier, and the ZL and ZR buttons are now behind the L and R buttons instead of being next to them.

The Classic Controller Pro is slated to be released in Japan in the summer. There are no plans for a release elsewhere yet.

Source: Nintendo of Japan