Here is Nima Arkani-Hamed giving a series of 5 talks as part of the Messenger Lectures at Cornell University:
Lecture 1: Setting the stage: Space-time and Quantum Mechanics
Lecture 2: Our "Standard Models" of particle physics and cosmology
Lecture 3: Spacetime is doomed: what replaces it?
Lecture 4: Why is there a macroscopic universe?
Lecture 5: A new golden age of experiments: What might we know by 2020?