I'm officially starting my 2018 7DRL now.
The basic idea for this game is that you will be controlling two characters simultaneously.
Game play will revolve around tactical positioning of your two characters relative to monsters, environment and so on and strategically upgrading them for some kind of synergy.
I did a little setup yesterday to get some of the basics in place: movement around a level, walls, and a basic monster that chases after you.
Here is how it's looking at "day 0":