While he hasn't mentioned anything date wise, he just confirmed to me in an email yesterday that it was coming out early 2018.
Here's part of the mail chain where he confirms it. It looks a little weird with the recipient because I sent an original email to the support email, which was then forwarded to Jeff's email, and he replied to it, and bcc'ed me (it looks like),
http://i.imgur.com/KfTbsv9.png