When I was superintendent of a school board in Nova Scotia, we nearly doubled our student population within 10 years by establishing a junior kindergarten program from age 4. Parents from exogamous families were hesitant to enrol their children in French-language schools because they felt their children didn't speak French well enough. Thanks to the creation of the JK program for four-year-olds, which is not officially a school program, links between parents and the school were forged, and parents are now less reticent about enrolling their children there.
Are you seeing this elsewhere in the country?