RC1 should be the final release candidate before a stable release. As usual, I could not help myself from doing a few changes in this release, as I think they are too important to be left out of 1.0.0.
The main change is the encapsulation of all the post permalink code in a new Frontend method called (you guessed it) getPermalink(). This will hopefully enable people to do weird things to their permalinks by overriding this method, without breaking plugins and template compatibility.
Related to this change is the addition of a new option (I promise it's the last one to be added) called 'post_suffix', which if not empty gets appended as-is to the post permalink. A typical use for this option is to have all post URLs end with something like '.html' (of course, you can also fool your users by setting it to something like '.py' or -- ugh! -- '.pl' or '.asp'). This is mainly for those migrating from a different environment, and wishing to preserve their permalinks.
You can download 1.0.0pre1 from the project area, where you will also find the full Changelog for this release.