These rumors come from prolific insider Jeff Grubb, speaking on Giant Bomb's Game Mess Mornings podcast. Grubb notes that any internal discussions about Eidos Montreal's next project are very early, but he says that the studio is eager to return to Deus Ex.
"It's early. The rumbling I've heard is that the studio wants to immediately get into Deus Ex. They want to get right back into that. They want to challenge - they want to do what Cyberpunk 2077 couldn't, and stuff like that."