Logos 4.2 (v4.20.4.7970) was released on Monday, December 6. If you have automatic updates turned on, it will be downloaded automatically the next time your system checks for updates. To install it right away, enter "update now" into the command box.
Release Notes for Logos 4.2 can be found here: http://wiki.logos.com/Logos_4.2.
Note: There is a large resource download included with 4.2, so if you update from 4.1 to 4.2, you will get this download. Details about the size of the download and the updated resources can be found here: http://community.logos.com/forums/t/25608.aspx.