Android P has not been officially presented to the world yet, but the first version for mobile programmers (Developer Preview) has already appeared. For now, it has not implemented many new functionalities, but it gives a general look at what the new Android will be. Owners of older Nexus, i.e. Nexus 5X and Nexus 6P smartphones as well as the Pixel C tablet will not install a new operating system.
Android P Developer Preview was released so that people creating mobile applications had time to adapt their products to the new operating system. However, Google, in accordance with the previously adopted policy, ceased support for smartphones from the Nexus series. Therefore, if you want to get acquainted with the latest Android, you should get one of the smartphones from the Pixel series (Pixel, Pixel XL, Pixel 2 or Pixel 2 XL). All older devices are not supported by the new Android. The fact is also that such a limitation should not surprise anyone. Nexus 5X and Nexus 6P appeared on the market in 2015.
The final version of Android P will appear in the third quarter of this year
Before the Pixel series devices appeared, Google had adopted a two-year support policy in the form of providing system updates. Android P will appear no earlier than November this year, which means that Nexus 5X and Nexus 6P will be three years old devices. Therefore, their holders should not blame Google. However, this device will continue to receive monthly security updates.
In turn, Pixel 2 and Pixel 2 XL are guaranteed a three-year period of updating the operating system. In practice, this means that these smartphones will receive from Google Android R, which will be released in 2020. However, Apple continues to be the champion of long-term support. A good example here is the iPhone 5S, which, despite its launch in 2013, recently received an update to the latest iOS 11.
Source: Ars Technica