You can also use the search functionality in the Official Microsoft Flight Simulator > News & Announcements applying tags:
world-update :
https://forums.flightsimulator.com/tags/c/official/news-and-announcements/141/world-update
city-update :
https://forums.flightsimulator.com/tags/c/official/news-and-announcements/141/city-update
(Did not find a stand alone announcement for City-Update 1, the only reference to CU1 can be found here: [BLOG] August 25, 2022 Development Update )