There's some difference in how 3.12.0 handles fonts though, it's been mentioned in GeoffR's patch thread. In 3.11.0 with his patch, some fonts still didn't work correctly when you went to the Advanced Settings. In 3.12.0 it seems all fonts now correctly change as they should through the Advanced Settings, even your sideloaded extra fonts. For that alone it might be worth the upgrade for most. I haven't noticed that it's broken anything yet as well, which is always a plus!
