You can find the full release notes for Game Update 9 here.
For yesterday's Game Update 9.1, you can find the release notes here
Please follow this link for the Release Notes for Game Update 10, released February 23rd
You can find the Release Notes for Game Update 10.1 (released on March 10th) here
We have just released Game Update 10.2 - you can find the full Release Notes here
Game Update 11 was released on May 25th alongside "Tourist Season". You can find the Release Notes here.
You can find the Release Notes for Game Update 11.1 (released on June 22nd) here