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#21
The image you linked to shows three version numbers, 1511, 1602 and 1606. These do not refer to versions of Windows 10, they are version numbers for the System Center Configuration Manager. It is support for the Configuration Manager v. 1511 that's ending, not Windows 10 v. 1511. We are still getting CUs for the original 10240 - the latest being Dec. 13th, so 1511 should be safe for a while yet :)