Yes, it’s that time again! A new version of WordPress is on the way, and the first beta is now ready for testing and seeing what you can break.
As always, don’t install a beta on a live site unless you really know what you’re doing and you’ve got backups of your backups all nicely backed up. Did I mention backups?
The new version includes some prettification of the admin interface, and a new fancy media uploader, which does look like an improvement on the current Flash-based one.
Details and download link from the metaphorical horse’s mouth:

