@drb1992: Yes, a kind of a dissappearing/appering visual fx is planned. 
@cDub: The lighting actually consists of two stationary directional lights with no shadows and a high indirect lighting value. On top of that are the lights on the ceiling that are static points lights with no shadows as well and a high intensity value to add some high-lights (+ the blue “energy” and some decorative cubes are also used for lighting highlights).
@Ahmad96Ragab: Yes, the last puzzle is very advanced but still a showcase and such difficult puzzles will appear later in the game. For the story there will be a well balanced learning experience to challenge the player while not overwhelming him. Speaking of next-to-impossible: something like this will be there but only in form of the challenge maps.