Audi took the covers off its long-awaited Q6 E-Tron this week. The electric compact crossover is a smidgen longer than the Tesla Model Y, and will start sales in the U.S. late this year both in regular and sporty SQ6 guises. BMW revealed the Vision Neue Klasse X, a concept that previews the automaker’s rival to the Q6 E-Tron. It enters production…