Yes you can. Concept art mean that they are thinking about it and very likely planning it. It does not mean it will be in the game, but it is possible. Even screenshots can be misleading.
Thats why i said you can't conclude anything. Meaning you cant say something is 100% confirmed from concept art. I know concept art is for what the developers would like to do, but it doesnt mean they will do. If a screenshot has lava, then one can logically conclude that lava will indeed be in the game.
Reading ones words requires more then just looking. It also requires understanding and correctly interpreting what was written.