Logitech Create Keyboard
Third-party accessories for the iPad Pro are already being announced, and Logitech was one of the first ones to come up with their first iPad Pro accessory.
The Logitech Create keyboard for the iPad Pro looks to take on Apple's Smart Keyboard. There's not a lot of info about it right now, but it looks to just be an alternative that could provide a different typing experience for iPad Pro users.
And just like with the Smart Keyboard, the Create uses the dock connector on the iPad so that the keyboard attachment never needs charged or paired.