4.2 Beta 1 (v4.20.4.6028) is available for testing.
To upgrade from 4.1 SR-3, enter "set update channel to beta" command to begin download, or "update now" if you've already switched to the beta channel. To install Beta 1 from scratch, see the notes and download link at http://community.logos.com/forums/t/8883.aspx.
For Release Notes, see http://wiki.logos.com/4.2_Beta_1.