This report describes developments in the new generation of cross-sector collaborations for education and presents findings from a scan of such initiatives across the United States. We describe the broad ecology of cross-sector collaborations for educational improvement and examine various rationales for the current interest in collaboration. We explore the prominent new model of collaboration known as "collective impact," review the history of cross-sector collaborations for education, and revisit some reasons for cautious optimism about the changing context for collaboration. Then, using information from public websites, we describe characteristics of the national array of current collaborations. We report an additional analysis, based on multiple data sources, of factors that seem to position some cities to develop cross-sector collaborations while others are less likely to do so. To conclude, we revisit some trends and considerations that are worth watching, acknowledging that new efforts are often layered on the foundation of previous collaborations but also take place in an altered context with new possibilities and challenges.