You're not gonig to get many bits on this. Too specific.
But yeah, from experience, I'll make an educated guess that nearly everyone applies again. Even people who are mostly happy in a lower tier school apply, because sure would be nice to hit the lottery and not have to worry about schools for the next 5 years. Everyone is always trying to move up.
But mostly, from PreS-3 to PreK-4, there's a lot of movement because many of the desirable schools don't have preS-3. Most of the most desirable schools start at PreK-4. So, parents in boundary for a desirable prek school will try to get to their in boundary school, knowing they can wait another year until they will automatically be admitted in K.