The future of Harvard Law School is emerging on Massachusetts Avenue, like a present waiting to be opened. Slated to be completed in December 2011, the environmentally friendly, 250,000-square-foot complex—with an academic building that will support the innovations in teaching that have been introduced into the school’s curriculum, an expansive student center and a new centralized home for the school’s burgeoning clinical program—is already revealing its handsome facade now that much of the scaffolding has come down.