If creating the project, choose Android API 24, we see just the Android symbol 6.x. I am immediately reminded of the situation when Google really keeping the first digit, has released a new sweet name and version of the system. For example, with Android 4.x: Android 4.0 - Ice Cream Sandwich, Android 4.1-4.3 - Jelly Bean and Android 4.4 KitKat. And only after that the world saw Android 5.0 - Lollipop.
Edition mobiltelefon.ru, referring in turn to the resources Google reports that Android N, which we anticipate may not be Android 7.0. It would seem majornelson update, developer preview available for developers and users, it would be time already and the first digit to change. But in the resources of your environment to develop Android Studio, found evidence that Android N may be 6 Android.x.