Witten is lecturing at a conference in Crete this week and some of his transparencies are already online. He is talking about perturbative gauge theory amplitudes and the idea of interpreting them in terms of strings in twistor space. He motivates this by noting that AdS/CFT is useful for understanding gauge theories at large g^2N, but at short distances asymptotic freedom implies g^2N is small and to understand gauge theory in terms of strings you need to do so for all g^2N. He warns “I can’t promise that what I’ll explain will turn out ot be useful in a string description of QCD, but at least I’ll tell you interesting things about perturbative gauge theory!”.
For something completely different, the latest on the Landscape is that, at least this week it predicts low energy supersymmetry, maybe.