If he's been doing preK academics for sometime it seems like that wouldn't be any more of a fit for him this year than it would be the following year, would it? Maybe I'm missing something. Some kids really look forward to school are disappointed because they didn't really imagine what it would actually be like.

If what is appealing to him is being around other kids is there any possibility he could go to a playgroup, preschool, or homeschool type of activity?