Not. Apple's policy isn't some mystery.
https://support.apple.com/en-us/HT201624
Clock starts ticking when the next product superseding it gets released.
4,1 -> 5,1 transition 2010 --> ( 2010 + 6 ) = 2016 dropped. ( 6 is in the range of 5-7).
5,1 -> 6,1 transition 2013 --> (2013 + 5 ) = 2018 dropped. ( since there is a 3 year gap between those two transition points Apple will likely select the shortest date in there openly stated range. )
Yes, this is hardware, but there is no rational business sense in doing large scale software support for obsolete hardware. Especially doing it for free.
The 2012 model speed bump was nothing but parts targeted for the 2010 era. Kicking the can into 2018 is pragmatically already a gift.
Folks should have some solid plan in 2017 to get the migration done. The CPUs have been deupported by Intel. Most of the rest of the components are going be in the same state.
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Wrong. Again.