WordPress 3.5 RC3  has been released, I am expecting it to be the last RC and we will see the final WordPress 3.5 sometime within this week. No idea whether they will meet the originally targeted date of 5th December 2012.
- Final UI improvements for the new media manager, based on lots of great feedback.
- Show more information about uploading errors when they occur.
- When inserting an image into a post, don’t forget the alternative text.
- Fixes for the new admin button styles.
- Improvements for mobile devices, Internet Explorer, and right-to-left languages.
- Fix cookies for subdomain installs when multisite is installed in a subdirectory.
- Fix ms-files.php rewriting for very old multisite installs.
Here is a list of pending issues (6 left): http://core.trac.wordpress.org/report/5 
Download: WordPress 3.5 RC3