Players Reporting Global Spawn-Point Change

Players across the globe have taken to The Silph Road's Reddit and other social media platforms during the afternoon of Wednesday, September 25, 2019 to report changes to many common spawn-points for Pokemon.

New spawn points live? from r/TheSilphRoad

Congrats on the New Spawn Points, But it Should be Noted that Many Spawn Points were Removed from r/TheSilphRoad

Did spawn points just drastically change or reset? from r/TheSilphRoad

No official sources linked to Niantic or the Pokemon Company have currently commented regarding any changes, and no official channels have provided any form of confirmation as of yet, but the consensus among most players seems to be that many spawn points in the game have been added, changed, or even removed in some cases.

Update 9/27/2019

Niantic has officially addressed the changes to spawn points via their Twitter account

We're always looking for new ways to optimize the Pokémon GO experience for Trainers. To this end, we've recently updated where Pokémon can be encountered. We strive to improve with every change and thank you for your feedback. Stay tuned for more details.

— Niantic Support (@NianticHelp) September 27, 2019