The Pro Controller lacks the screen of the primary Wii U control pad, and features a more traditional design resembling an Xbox 360 controller.
One unique difference between the Pro Controller and an Xbox 360 pad is the right analogue stick placement, which is in a more prominent location higher on the controller, while the face buttons are lower.
Though a break from traditional controller design, the layout makes the Pro Controller consistent with the full Wii U control pad.
Nintendo also confirmed the updated Wii U controller, which was leaked last month.
The updated Wii U control pad features analogue sticks instead of circle pads, revised button placement and a wider screen, according to NeoGAF.
It also has a near-field communication (NFC) reader, where objects or cards can be scanned to load data into games, similar to the functionality in Skylanders: Spyro's Adventures.
The Wii U control pad will also feature a TV control button, turning the controller's screen into a universal television remote when the console is not powered on.
Both the Wii U control pad and Wii U Pro Controller can be used on the same console together at the same time.
Nintendo unveiled its new controller designs during its pre-E3 Wii U presentation.
Nintendo's E3 2012 press conference takes place on Tuesday, June 5 at 5pm BST (11pm EDT).
The E3 Expo will take place in Los Angeles from June 4 to June 7.
> E3 2012: Digital Spy's coverage from the world's biggest gaming expo
Watch a video of the Wii U's E3 2011 reveal below: