If you're one of the people who rushed to upgrade to Windows 10, you'll be happy to know that the Android tools in the SDK work just as they did before.
While a lot of things for developers using the full Android Studio IDE are dependent on your computer's operating system and the right version of Java being installed, the basic tools that many Android users need — adb, fastboot and DDMS — work just fine. If you're upgrading a previous build of Windows that had the Android SDK (whether just the tools or the full Android Studio) installed, you won't have to do a thing to stay up and running. A fresh installation should be fine using the files provided from Google.
Now we do expect the SDK, the tools and the drivers to get some sort of update for Windows in the near future. As with any new software, there will be bugs. You'll be able to run the SDK manager to install any new files if and when they become available.