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Re:The New Motorola Moto X (2nd Gen) Review by tcoppi on Wednesday September 17, 2014 @01:50PM (#8331308)
There is no guaranteed upgrade window for Nexus phones/tablets.
Re:The New Motorola Moto X (2nd Gen) Review by danieldk on Wednesday September 17, 2014 @01:55PM (#8331342)
Devices may not receive the latest version of Android if they fall outside of the update window, traditionally around 18 months after a device release.

https://support.google.com/nexus/answer/4457705?hl=en