You're saying that this will be more close and corridor type than the original. Is that, isn't it?
I hope not, but I wouldn't hold my breath. But even though, the current highlight is still too much. But we only will know for sure when we play it.
It will probably play like crysis 2 you will be able to pick different routes with choices that's all. If you played Mass Effect 2 it will probably be something like that. Linear tunnels and a limited open world. The game is not promising a open world just some exploring.