I ordered a back silicon cover for my 9.7" Pro as well as the Smart Keyboard. The silicon cover shipped today and should arrive around the same time as my iPad. The Smart Keyboard is back ordered. I paid the extra shipping, so it says it could arrive by April 7th or something like that.
I'm a little disappointed that there's going to be such a delay, since the keyboard cover is such a huge reason I went for a new iPad Pro and is also given the job of protecting the screen. On the other hand, I am selling my rMBP on eBay to cover the cost of my order, so I'm not even going to open my stuff until I'm 100% sure it's sold.