Steve gave a talk at Ecole Polytechnique today describing a model for the optimal way to purchase a large number of shares of an asset against a limit-order sell book of arbitrary shape. This generalizes the recent but already well--known work of Obizhaeva and Wang using clever stochastic analysis arguments.
If you missed his talk today you can still watch it tomorrow at the Petits Déjeuners de la Finance.
After that he will be en route to London where he is going to deliver one of his trademark courses on stochastic calculus. Everyone who has ever attended one of his talks knows why banking types pay big money for his lectures.