I'm aware of both... I was making sure I hadn't missed a button somewhere.
Then I guess it's a (very simple) feature request: since we can already see the changelog within the app whenever there's an update, it would be useful to be able to see that at any time from within there (I figure it's polling the update server and getting that, which means any time you click to check for updates that info is probably ready and available with minimal if any extra overhead).
Edit: I see that
http://liveupdate.flashfxp.com/verify.php (with lots of authentication options in the URL) already dumps all this info if one's installation is not up-to-date.