As Los Angeles public school students return to school Tuesday, more of them will enter language immersion programs. It’s an approach that’s become more and more popular despite Proposition 227, the state law that practically banned bilingual education back in 1998. A measure on the November ballot would repeal most of Proposition 227, effectively allowing teachers to teach in languages other than English. If it passes, how will instruction change for the 1.3 million English learners in California’s public schools?