[bhaak]

I wouldn't hold my breath for better typography. You'll notice that the default Kindle font is designed so that it looks in absence of kerning.

The Kindles are using internally the freetype library but it is a crippled version. Some fonts make it crash and kerning is apparently compiled out.

That's why the Jailbreak community is distributing their own version of it because otherwise the various jailbreak ereader wouldn't work properly.