I made quick list of engines used by “prominent” E3 games. All the games listed at e3recap.com
https://docs.google.com/spreadsheets/d/1AAAeTiwDxi6QDEHql0BInwU-RaI26DXolYFJBTINQ38/edit#gid=0
Unreal’s twitter profile pointed me some games. But maybe there are few more “unrecognized” UE titles in this spreadsheet? 