The KDE 4 development team started a discussion about KDE 4 release plans.
They proposed the following sequence of release versions:
April 2 A soft freezing of the kdelibs software interfaces and the release of the alpha1 version.
At this stage, the kdelibs software interfaces will be frozen. This means that changes to classes and interfaces will not be made and accepted. It also means the end of the famous Mondays bic.
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May 2 Freeze opportunity.
After this date, the main KDE modules will be frozen and the addition of new features will not be accepted. The focus will be on application stability and error correction. By this date, all developers of the main modules must announce the readiness of the modules. Otherwise, the modules will be rejected and will not be released with KDE 4.0.
June 2 Freezing informational messages.
After this date, the main modules will be frozen to add new messages. If you still need this, send a request to the kde-i18n mailing list.
July 2 Beginning of beta testing cycles.