The envisionment of SIN is to bring you what was promised by GSC for STALKER: Shadow of Chernobyl, instead of the gutted retail release we were left with. SIN aims to cover every aspect imaginable from gameplay intended to genuinely scare the player, to graphics for the absolute best visual experience, cut mutants, absolute realism, optimisations, stability, and a complete game mechanics overhaul, all without breaking the story. The idea is to present the player with a complete retail experience for the purist that liked SoC but wished it was far more fleshed out. In no way what so ever does SIN try to be like old beta or alpha builds of SoC, SIN aims to enhance everything SoC already has and give it continuity with CS and CoP - nothing more, nothing less.
Consider this early alpha testing but does exactly what it says on the tin. A few light sources seem like I need to fix them up some more such as the light at the end of the video but X-Ray will be X-Ray, bugs upon bugs.