The Bloodborne panel at PSX was really good. Miyazaki went over in detail the thinking behind the Chalice Dungeon and what we should expect from this 'procedurally generated dungeon'. It sounds like this area is optional, so players who don't like randomization can avoid it. But once a player has locked it in, it doesn't change if/when you die as you progress thru it.
I really liked his walkthrough of the dungeon as it was being played (in co-op). The players would pause frequently so Miyazaki could talk about certain elements we were seeing in the game. It was more detailed than the 5-minute runthrough we saw at the keynote.
And just hearing Miyazaki talk about the game was awesome.