As you have read here, His Robot Wife: A Great Deal of Patience will be available 9-9-17. It is already available for pre-order at Amazon, Barnes and Noble, and iBooks. I had always been under the impression that Smashwords has a pre-order system, as they allow pre-orders through them to other retailers (like B&N and iBooks), but they don’t. So, if you prefer to purchase your ebooks through Smashwords, just remember to get it on September 9th.
Also, for those who are interested, there will be a paperback edition sold through Amazon, on or shortly after 9-9-17. I don’t have a price yet, but I suspect it will be about $6. I’ll post the price and other info when I have it.