It won’t happen anytime soon, but the one game I wish they’d do a sequel for is Stellaris. It was their first stab at a 4X hybrid as well as a game not rooted in history, so it’s not surprising to me that it’s been harder for them to nail down the design. I’d love to see them take the lessons learned and start from the ground up but it won’t happen anytime soon with how prominent the game is and how well it’s doing.