From Fedora Project Wiki
Release Notes
This is only a placeholder for the actual release notes which are available at http://fedorapeople.org/groups/docs/release-notes/
General Information
Download Fedora 15 Beta now
To download Fedora 15 Beta, visit http://fedoraproject.org/get-prerelease. Download options are available for BitTorrent, direct download, and Jigdo. This release is available for all 32-bit and 64-bit Intel-compatible platforms. Note that Fedora uses SHA256 instead of MD5 or SHA-1 to verify images in a more secure way.
To download Fedora 15 Beta, visit http://fedoraproject.org/get-prerelease. Download options are available for BitTorrent, direct download, and Jigdo. This release is available for all 32-bit and 64-bit Intel-compatible platforms. Note that Fedora uses SHA256 instead of MD5 or SHA-1 to verify images in a more secure way.
Common Bugs
A list of common bugs known in the Fedora 15 Beta are available on the wiki here.
Filing Bug Reports
Please file bug reports on this Alpha release if you find any problems.