A bit more information ….
As far as I can make out from the map on the Lothian site, after going down Hanover Street, the 9 will continue along Dundas Street, then turn right into Great King Street before picking up the existing route at Bellevue.
There are also some changes to the northern end of the route around Granton and Muirhouse, but as I am not familiar with that area, I didn’t look to closely.
No news about changes to the detailed timetable, except that they say there will be additional journeys peak hours.
Hope this will be of interest.