What Amazon says is:
Quote:
Q: Will KF8 capabilities be available on all Kindle devices?
A: Kindle Fire is the first Kindle device to support KF8 - in the coming months we will roll out KF8 to our latest generation Kindle e-ink devices as well as our free Kindle reading apps.
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This implies that KF8 won't be available on the K3, and in addition it has typically been Amazon's practice that new capabilities are not back ported to older devices.