According to the official WordPress blog, WordPress 2.8 Release Candidate 1 was officially released about an hour ago.   Here is their release candidate 1 official announcement:

With Release Candidate 1, we think WordPress 2.8 is ready and complete.  Download it, test it, and tell us what you think.  If you don’t uncover any bad bugs, 2.8 will be released on Wednesday the 10th.

If you’re interested in what has changed since beta 2, consult the changelog.

You can download Release Candidate 1 here, and consult the changelog from Beta 2 here.   If you are wondering what all is new with WordPress 2.8, check out this post by TechnoSailor.