GeneXus X Evolution 3 Upgrade 8 previews were part of the releasing process of Upgrade 8. They were intended to round up Upgrade 8 and facilitate adoption once released.
Upgrade 8 has been released on May 11th, 2016
This list is updated dynamically every day with the new Features, issues that may affect compatibility and other: http://www.genexus.com/releasenotes?,,,0;4;XEV3;7;8;;