Mentioned on Ubuntu's website :The Ubuntu developers are moving quickly to bring you the absolute latest and greatest software the Open Source Community has to offer. The Karmic Koala Alpha 5 is the fifth alpha release of Ubuntu 9.10, bringing with it the earliest new features for the next version of Ubuntu.
It seems they are really working too hard to compete Snow Leopard and Windows 7.
New Features in this 5th Alpha release which makes it different the 3rd Alpha are mentioned below :
Gnome
The gdm 2.27.91 login manager is a complete rewrite compared to the version in earlier Ubuntu releases. In the Alpha 3 the gdm was 2.27.4.
Ubuntu UEC
Alpha 5 includes alpha images for the Ubuntu Enterprise Cloud (UEC) and Amazon's EC2. You can try out the latest Karmic server alpha instantly on EC2 using a preconfigured AMI, or download an image and put it into your own cloud with UEC.
Linux kernel 2.6.31
Alpha 5 includes the 2.6.31-9.29 kernel based on 2.6.31-rc8. The Alpha 3 had the 2.6.31-3.19 kernel based on 2.6.31-rc3. The kernel ships with Kernel Mode Setting enabled for Intel graphics.
iSCSI installation
The iSCSI installation process has been improved, and no longer requires iscsi=true as a boot parameter; the installer will offer you the option of logging into iSCSI targets if there are no local disks, or you can select "Configure iSCSI" in the manual partitioner. Putting the root filesystem on iSCSI is now supported.
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