iOS 9 was released yesterday. Just updated to iOS 9 on my iPhone 4s. Here are a few first impressions:
New system font
The new western font is called “San Francisco” and Chinese font is “Ping Fang (苹方)”
苹方字体更加圆润，但缺少了黑体一贯的稳重。
New Notes
With more formatting options and easy navigation to the attachments (photos, videos, etc.)
Easier apps switch
Saves the HOME button.
Smarter Spotlight
Now can directly show some results.
Low Power Mode
Reduced power consumption. The battery icon will turn orange.
iCloud Drive shows up in the home screen
Sadly this OS update doesn’t rescue my defective wifi.
Update 2015-09-18
九宫格输入法
终于加了九宫格，不再需要第三方输入法了。英文名称很奇怪：10 Key
