Mailing the story:

Ubuntu 12.04 LTS Precise Pangolin alpha 2 is available for download, we'll do a recap of all the changes since the previous milestone (alpha 1). The latest Unity, available in Ubuntu 12.04 Precise Pangolin alpha 2 feels very smooth and is actually quite stable for an alpha. Besides many bug fixes, there were also many tweaks and changes designed to make Ubuntu 12.04 "pixel perfect" and while we'll obviously not cover all of them, you can read about the most important changes below.