总的来说，

1. 代码上的重构
2. bug 的修复
3. 对新系统的支持
4. Appium 1.5 should work exactly the same as Appium 1.4.16
5. 没有看到 UIAutomator2 和 XCUITesting —— Support for Apple's new XCUITest framework is already in beta with appium-xcuitest-driver, and work is underway to add support for Google's new UiAutomator 2 framework into Appium as well.
6. npm install -g appium 安装即可，客户端还没出来

General

• Appium now requires Node 0.12 as a minimum Node version
• Deprecate server arguments that are also desired capabilities. Instead, add a --default-capabilities argument which takes a JSON string of capabilities that will be the default for any session. E.g., --default-capabilities '{"launchTimeout": 60000}'
• Various docs and contributing docs updates (including a code of conduct for the project)
• Add capability validation on the protocol and driver level. Along with this we have tightened up requirements on capability values so that they can be strictly validated. For example, before you were able to send in a string value of "180" for the newCommandTimeout capability. Now you must send in an actual JSON number, e.g., 180.
• Remove the autoLaunch capability since it added a significant amount of complexity to the startup flow and Appium shouldn't be responsible for this kind of use case
• Remove long-deprecated name locator strategy

iOS

• add Tapster support for some more touch methods
• iPhone 6 + 6S support
• iOS 9.3 support

Android

• enable navigating to an android URI via the set url driver methods, e.g., driver.get('content://contacts/people/1')
• fix some adb issues in Windows (e.g., signWithCustomCert, sdk binary names)
• fix issue with UIWatcher ssl certificate errors
• if you want to install all chromedrivers, use --chromedriver-install-all; if you want to install a specific chromedriver version, use --chromedriver-version="$VER"
• driver.closeApp no longer runs through the shutdown routine; it simply force-stops the app
• The ANDROID_ADB_SERVER_PORT environment variable has been removed in favor of the adbPortdesired capability, which does the same thing.

Non-exhaustive examples of internal changes

• see the developer's overview for a fuller description of Appium 1.5 from a developer's perspective
• get rid of reset.sh and various other appium build tools in favor of a simple npm install
• split apart Appium into various smaller modules each with their own repositories and NPM packages
• use gulp instead of grunt
• use babel to transpile from es2015+ to standard es5 code
• get rid of .appiumconfig.json