from Tim Vollmer at Creative Commons:

We’d like to share the 2nd draft of CC license version 4.0. It’s now released for public comment.

• Blogpost: http://creativecommons.org/weblog/entry/33632
• Drafts and related documentation. Here you can view the current draft license text and download the comparison chart between 4.0d1 and 4.0d2.
• Draft 2 Public Discussion Page. Here you can see a summary of changes and links to more detailed explanations of changes.

We look forward to the next round of input.