EfDM looks very much like Dungeon Master, but there's one major difference: EfDM is not grid-based, so it's more like Arx Fatalis than Dungeon Master.
(maybe LoG3 will not be grid-based, either?)
It should at least be 8-directional movement and walls, but I hope they really will add crafting (cooking, smithing,carpenting, etc) and multiplayer or splitable parties to it.
I played that demo a while back, very interesting to see such an old early rough version of Grimrock gameplay. It's fun in its own right, but I also makes me appreciate the polish of Grimrock all the more.
Looks nice. But I do hope they change the UI. I see increased risk of RSI coming with all the corners of the screen using the left/right hands of the champs to perform an action lol