There is a new study dealing with the works of Philo in the most recent issue of Journal for the Study of Judaism:
The Representation of Theatricality in Philo’s Embassy to Gaius
Journal for the Study of Judaism, Volume 39, Number 1, 2008 , pp. 46-67.
The study is presented thus: “In this paper I argue that Philo’s Embassy to Gaius makes use of the literary paradigm of theatricality, a strategy of representation marked by the portrayal of multiple and competing discourses amongst those in unequal relations of power, as well as an emphasis on the arts of acting and discernment. The Embassy marks an appearance of the theatrical paradigm which is earlier than its use by Tacitus, whose portrayal of Nero in the Annals Shadi Bartsch has seen as the harbinger of this theme in Roman historiography.”