M.C.
Hi CM
I have pretty strong opinions about preschools, because my first daughter had such anxiety and such a hard time separating from me. Bring your son to the new preschool and watch his reactions very carefully. I visited 6 preschools with my daughter and at most of them, she clung to me and was very nervous. At one of the preschools, she immediately saw the playground and ran out to play. She told one of the little boys "that toy is special to me and I was playing with it, can I have that back?" and talked to one of the teachers (which for her, was unheard of).
Even though the school was in, shall we say, not the "best area of town" and there were lots of kids there on "scholarships" because they could not afford it, and the school was very old and shabby, I sent my daughter there. This was not the "more popular" school, nor the most prestigious, but my daughter BLOSSOMED there. She grew so much in one year I could not believe it. She made friends of all colors and shapes, and she learned a lot about conflict resolution, interpersonal skills and taking turns.
Kids in the "IT" school learned about sitting quietly with legs crossed right over left, adding, subtracting, counting to 50, coloring within the lines and lots of stuff that a four year old does not need to be burdened with, in my opinion.
I know now that I made the right choice for my daughter, because I gave her what she needed at that time. Try to understand what it is that makes the school so "popular" - is it the "college prep" curriculum? The colorful, new playground equipment? The socioeconomic group of kids? Go in eyes wide open about what makes the school popular, because it may not be important to you (or, more importantly, your son). Choose wisely, and your son will thrive.