WordPress 2.07 just came out 2 hours ago and I have grabbed the script and upgraded it from WordPress 2.06, there aren’t any surprises to the upgrade, everything went smoothly. They fixed a Feedburner bug as well as other smaller details.

When upgrading your WordPress engine, be sure never to delete these files:

• wp-config.php file;
• wp-content folder; Special Exception: the wp-content/cache folder should be deleted.
• wp-images folder;
• wp-includes/languages/ folder–if you are using a language file do not delete that folder;
• .htaccess file–if you have added custom rules to your .htaccess, do not delete it;
• robots.txt file–if your blog lives in the root of your site (ie. the blog is the site) and you have created such a file, do not delete it.

At the time of this post, they have not released the change log:
http://codex.wordpress.org/WordPress_Versions

Affected files from WordPress 2.06:

• wp-admin/inline-uploading.php
• wp-admin/post.php
• wp-includes/classes.php
• wp-includes/functions.php
• wp-settings.php
• wp-includes/version.php

Things they fixed in this release:

• Security fix for wp_unregister_GLOBALS() to work around the zend_hash_del_key_or_index bug in PHP 4 versions less than 4.4.3 and PHP 5 versions less than 5.1.4 with register_globals set to “On.”
• Feeds now properly serve 304 Not Modified headers instead of mismatched 200/304 headers (a.k.a. the FeedBurner bug).
• Backport of another 304 Not Modified fix from WordPress 2.1
• Deleting WordPress Pages no longer gives an “Are You Sure?” prompt.
• After deleting a WordPress Page, you are now properly redirected to the Edit Pages screen.
• Sending an image at original size in Internet Explorer no longer adds an incorrect “height” attribute.

Good luck on upgrading your copy of WordPress, remember to backup your database and your wp-content files before beginning! You shouldn’t see any problems.

Song of the day for the new fix! YAY!