I believe that Logos provides updates to books for life. Of late, they have kindly released the Zondervan Bersion of Greek Grammar Beyond the Basics from Zondervan to those who owned the same book from Galaxie.
In a similar line, Christian Theology from Millard J Erickon 3rd Edition is on Pre-Pub. Will those who own the second edition get their books automatically updated?
Logos.com still permit existing owners of both the above books to order the new versions. A message clarifying what existing owners can expect will be helpful in both cases on the respective web pages.
In general, it will be helpful if Logos makes public the general policy in such situations - exactly when is a book update free and when do customers have to pay.