A request is just a request. WDW tries its best to accomdatae requests, but it can't be guaranteed. I wouldn't set your children up thinking they're going to stay in the Toy Story section so they won't be disappointed if it doesn't happen. The Toy Story section is ASMo's most requested section, and there are limited number of rooms opening up every day. If it happens, your kids and you will be in for a great suprise, if it doesn't happen, realize that WDW did try, but there might not have been any openings the time you checked in.