Hitch -- as for the Go To menu, it has always shown individual chapters, for a given value of "whatever has been properly formatted into the navigational ToC.
The nav elements are scrollable and sort of appear in an embedded view in the Go To menu, almost like the toc.ncx is rendered in an iframe as its own Go To element. Guide elements appear above and below.
I have been made aware that Kindle Previewer shows stuff a little different from the way E-Ink Kindles do, but I figure you'd know this already, what with all the testing devices you own.
