Ubuntu 10.04 LTS Lucid Lynx Release Candidate is available for download.
There aren't many visual changes since Beta 2, however we're going to cover this few changes anyway.
Note: If you've installed Ubuntu 10.04 Lucid Lynx Alpha, Beta 1 or 2 and kept upgrading, you already have all the changes in this post.
Firstly, the default Humanity icons got a new, darker color for the folder icons:
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http://www.webupd8.org/2010/04/ubuntu-1004-lts-lucid-lynx-release.html