This post is written from the new WordPress 2.7 beta 1 that was released a few hours ago. So far so good:

1. Upgrade was without issues
2. All my plugins work
3. The new backend is confusing for a few seconds but once you start using it feels great

On the bad side I’m so curious who was the genius that changed “Write Posts” to “Add New” and “Manage Posts” to “Edit”

So if you are eager to try it, go ahead and download your copy from here