The latest game reveal happening at E3 2019 actually came from the convention itself as we now know a new Darksiders game is on the way. Several people picked up the news from E3's own website revealing all the panels coming to the Coliseum, where they list a panel called Darksiders: Action Adventure Evolved for Thursday morning at 10:30am. As you can see from the description below, the panel will be discussing a new game on the way, but its unclear as to who exactly will be doing the panel as it makes absolutely no mention of either Gunfire Games or THQ Nordic.
A discussion about the inception of the Darksiders universe and where it's headed next. This panel will coincide with the E3 2019 unveil of a brand new Darksiders game that takes the franchise in a fresh direction. This is a panel discussion about the art and business of creating and maintaining an action adventure franchise rich in-game and corporate lore.
Considering how soon Darksiders 3 was released to this announcement, we're guessing that we're not getting anything more than a game announcement and some details here and there. That is, if it is a new game and not just a collection of the three main games. We'll see what happens come June 13th.