The Beta 4 release of Notes/Domino and the Extended Products for 7 will be available for download soon (within a few days). It will be our final beta release for 7, in which we hope you will see notable improvements over Beta 3. Beta 4 will be a production, as opposed to non-production, release. Betas 1,2 and 3 were all non-production releases.
From the Notes/Domino 7 beta forum.