It may be a little late but I know of an excellent preschool in Newton :
To all parents moving to Newton or the area.
There is a wonderful preschool in Newton Highlands called Golden Days. The director is Janice Golden and is absolutely wonderful. They have an opening starting in December for a preschooler.
Golden Days Children's Center Home
It's really an outstanding school: all the teachers have higher degrees of education, the location is really good and facilities are great (they even have a gym for the cold or rainy days to run out some energy), the communication is very open and frequent (emails and letters and photos every week!).
So if you're looking to move to Newton with your little one, this is the place I would recommend.
Note: I'm not in any way affiliated with the school but we are leaving the area and the spot for our son is freeing up. I just wish that I could take the school with us!!
~~Marie