That would be the first phone running pmos with targeted "10 year life-cycle for smartphones"

To my understanding armhf/armv6 is still supported; there was a time when armv7 was introduced where armv6 was dropped and restored shortly after. There was interesting thread in mailing list called "Should we drop armhf (armv6) support with 3.10 release?" but as for now they haven't decided yet if they want to drop it in 3.11 or keep it longer

Some opensource projects already squat on 0xF055