The fourth alpha release of Ubuntu 9.10 (codename “Karmic Koala”) has been released. This release includes Linux kernel 2.6.31-rc5, GRUB 2, GNOME 2.27.5, Ubuntu One, Firefox 3.5.2, Palimpsest Disk Utility, and so on. For more information, please see also Karmic Koala Alpha 4 Release Notes. The following are some screenshots of Ubuntu 9.10 Alpha 4. See them here