According to the timestamp on the page, it is the future because, as of the time of writing, there is no place on Earth where 31st of October is a reality.

Developer Guide for Dynamics 365 Customer Engagement, version 9.0, the release formerly known as July 2017 Update for Dynamics 365 (online), is now available and I must say, it seems to be organized pretty well and overall first impression is good. Time will tell.