If you've been waiting patiently for the Nexus 9 Keyboard Folio case to pop up on the Play Store (or your Amazon order has been delayed interminably), it's there - at least in the US.
For $129, you can have the case in your hands early next week, most likely, and then you'll be typing away. The Keyboard Folio case has a full smart cover-style folding system and, while it is quite bulky, will probably be the only case/keyboard combo for the Nexus 9 available.
It comes in black, or black.