1) I get some SERIOUS uncanny valley with that Alice.
2) Despite having loved the tone of the earlier game, that trailer does not fill me with hope. The music is too cheerful (despite the sudden shift at the end) and the colours and models seem not to fit together well. I'm assuming it was intentional, to create a tension between the elements, but when you do that you want something to emerge from the tension. You don't just want something to be alternatingly creepy and cute, you want that special feeling you get when the two work together and against one another to create a wholly unique tone. This looks more like someone just glued together happy things and creepy things and hoped that the result happened to fall together well. That "cute creepy" aesthetic seems to me to be really difficult to nail down and the trailer doesn't really manage to evoke it for me.
3) As others have said: what? We already know how the fire started. He's either going to have to do some serious retconning or come up with a pretty silly story about how other actions "lead up to" the fire in a way that we didn't previously know about. Both options seem pretty likely to diminish the importance of the last game, which leaves a bit of a sour taste in my mouth.
Really, I think this was a beloved game best left alone. Maybe remade, but a sequel seems like a poor idea. I could also definitely see a spiritual sequel maybe dealing with another similar story in a similar way, just not a direct sequel.