As a former K-8 tech instructor, who had to setup "Computer Classes" for the PreK section, I also question what truly culturally meaningful computer science lessons can be taught to PreK classes effectively. Trying to keep them all on track in Millie's Math House was hard enough. My experience has been that if the teachers can use tech effectively, the students don't need "computer science" for a while. You want to do something? Teach LOGO, or an analogue thereof; or just simple circuits. Circuits should fit into a science curriculum well. But OSs, dominant programming languages, input devices, even office suite layouts will likely all be different by the time they're out of 3rd grade.