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Note that it's a "guaranteed" date. Considering Android O works with Nexus 6P devices, I don't see them arbitrarily pulling the rug out from under us quite yet. I also don't imagine that any O point release will stop support either, so we'll likely see the 6P updated through the life of O.

That being said, three years seems like a ridiculously short "guaranteed support" lifetime... especially considering the iPhone 5 (released nearly 5 years ago) is losing support this year.