Update: Moodle 2.0 is out. Officially released November 24th, 2010 and available for download: http://download.moodle.org/.
You can get your hands on a book highlighting all the new features and tools written by Mary Cooch (@Moodlefairy): Packt’s First Look at Moodle 2.0
The following is a break down of all the new or upgraded features from Moodle 2.0 and where you can find Documentation, Video, or just learn about them. As of now, not all features are available or testable, but you can get a great feel for how Moodle2.0 will look and feel.
Official MoodleHQ videos: http://www.youtube.com/view_play_list?p=5F39867B1037BA89
Special thanks to those that have made such great video screencasts of the new/changed features: Gavin Henrick, Mary Cooch, and especially the 2.0 code contributors and developers.
Want to know about something else or have a link/video/info we can add to the spreadsheet? Request a video or synopsis of the feature in the comments and we’ll see what we can do.
Currently on Moodle Preview Release 4 (http://docs.moodle.org/en/Moodle_2.0_Preview_4_release_notes)
|Community Hubs||@mn, MOOCH, @synergylearning,
grading: @markdrechsler 
|File Repository||@ghenrick, @ghenrick2|
Here are some great sources for Moodle 2.0 information:
- Gavin Henrick’s great site: http://moodle.drupalgardens.com/
- Moodle.org’s 2.0 documentation: http://docs.moodle.org/en/Moodle_2.0_release_notes
- Moodle Fairy’s blog: http://www.moodleblog.org/