We have redesigned the contacts search screen (available via the Contacts link in the main navigation) to match the new style of Sitefinity Insight.
We've added a new column "Became a contact" which represents the date of which a given visitor became a contact. This column is sortable.
Various search performance optimizations have also been made.
The set of data and metrics are the same and have not changed compared to the previous version of the screen.