Also, remember that a request is just that...a request. There are no guarantees.
For our August trip, I made no requests at all. We booked a standard room at WL. My kids were hoping for bunk beds, but I'd learned just a few weeks prior to our arrival that they were not available in a standard view room.
Undaunted, when it was my turn in the check-in line I very politely asked the CM if there happened to be any bunk-bedded rooms available; that my kids were hoping for one, and I promised them I'd ask. Cue the pixie dust, and we ended up with an awesome courtyard-view room with bunks (looked toward the pool area) on the first floor, just a short walk to the food court and very quiet location.
Moral of the story is...you can make them before arriving, and still not get them. You can make no requests at all until you're standing at the desk, and luck out. You just never know.