http://drupal.org/drupal-7.0-beta1
What's new?
Tons of stuff! A revamped user interface, a new admin and default core theme, image handling in core, fields (CCK!) in core, module and theme upgrades from within the browser, an automated testing framework with over 24,000 tests, improved security and scalability, revamped database, AJAX, and file systems, jQuery 1.4, jQuery UI 1.8, RDFa, and literally gazillions of other things! Please see CHANGELOG.txt for a comprehensive list of all improvements in Drupal 7.
changelog:
http://drupalcode.org/viewvc/d...revision=1.373&view=markup