Toma Albers, one of the KDE Developers sent out a note today that there will be an RC3 release for KDE 4.4, prior to the final release scheduled February 9th.
The biggest thing to note is that this will not delay the tagging or release of KDE 4.4. Here’s the official announcement from the KDE Mailing List which explains why the extra RC was warranted:
The release team has decided to insert an additional Release Candidate before the final 4.4.0. This release candidate will be tagged next thursday (28th) and will be released as soon as the tarballs are confirmed to be ok, ideally the same day.
The extra RC is added due to the struggle we had with the RC2 tarballs. We want to make sure everything is ok now, so the 4.4.0 release will not be delayed by similar issues.
bit more here