Whatever you do listen to your fans and be building an entirely new engine instead of whatever is supposedly holding you back that you just refreshed going into D2. Also make a clean break from the current gen consoles and just put it on PS5/SeXbox/PC instead of what you did with D1 with cross gen that held you back. I get that you will have a lot of players from the current get that are upset with you for doing so but not doing so will only create more headaches than they are worth. I have a feeling that D3 is being worked on and is closer than people think seeing as how most of your resources seem to be going into something other than the main game. If I'm wrong oh well but if I'm right then please don't make the same mistake you made with the first two games.
Oh and don't make it anything like D2 if you could please, thanks.
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Don’t send a team to start making the sequel early on, or from a different dev era. Don’t reboot development a year out to launch. Keep core mechanics throughout its lifespan.