That video from VaatiVidya about the gameplay is great. It only uses what is shown in the trailer itself (it mentions previous leaks) but manages to extract a ton of information and exposes it in an enthusiastic but logical manner. It has convinced me the game is definitively very close to the Souls formula, but with a lot of changes making it something different at the same time (and stealth definitively has a role, although probably won't be a very prominent one).