I requested a room at the BC in May with a view of the illuminations and was told that they did not have rooms with that view. Think I have read of others getting rooms with a view but that is what I was told.
I do believe we had a room with a view of fireworks at the BC. That was so long ago. I do remember seeing Spaceship Earth from our room but I could be wrong about the fireworks.
We were able to see the fireworks from our room at the BCV for sure.
There is a partial view of spaceship earth, but I think they can't guarentee you a view of illuminations because it would only be partial. I was sitting at the pool one night and could see the fireworks over top of the trees. If you just walk out to the beach or to the bridge that heads over to the boardwalk, you can see quite a bit!! But for the most part I think the trees block the view from the side of the Hotel that faces Epcots direction.........