I used wayback machine to find all changes over time. There were 4 changes to the roadmap from what I found in the archive.
Some more stats about the data:
There have been a total of 37 downloads of the website from Wayback machine. Which happened in spurts.
2014: Checks happened 8 out of 12 months and between 1 and 4 data points per month. Largest time between checks was 2 months.
2015: Checks happened 5 out of 11 months and between 1 and 7 data points per month. Largest time between checks was 4 months.
Update: 7 December 2016, noticed another updated to roadmap.
Update: 5 April 2016, Another update was posted Feb 2nd. Looks like they prematurely made engine and tech raise to 90% ^_~ Radiant makes that last 10% seem like more that the previous 90%.
Update: 6 July 2016, Noticed update to road map. Date at reports it was updated May 18th. I have noticed a big jump in GM sending people to attack. More story lines and conclusions to story lines would be great. But I think buildings have made a big jump along with classes recently.