If he not going to start prep until 2014 then that will be the reason you were asked to wait until next year.
This time of year is really hectic at schools.
Many of the senior staff are trying to teach, sort out year level structures, do, read and proof read reports along with all the other things that need to be done by the end of the year.

If you have paid a deposit for the private school then you might lose it. Depending on how popular the school is next year should be fine to enroll him