Originally Posted by markdek
What is KF8?
KF8 is Amazon's next file format, which will include most of the features of ePub, that is, HTML4 and CSS, rather than a very limited and customised form of HTML 3.2.
The next K4s apparently include support in firmware already. The KKs will need a firmware update to support it.
Amazon has said that 'all current' kindles will support KF8, but some people wonder whether this includes the KK.