How will rooms feel different/unique in Rebirth? In my opinion, a lot of the rooms in the original game felt about the same, with only a few that really stood out (narrow hallways grumble grumble).

well the biggest change aside from 100s new room layouts would be the room size changes. there will be different sized rooms than the original and that will be pretty fun to design around.

there will also be quite a few new room types and some secret aspects to rooms that i cant talk about just yet.