Although the official theme is "Java One and You" the unofficial theme seems to be asynchronicity in various for. Whether it be in the "New New IO" API (N^2IO), the Fork/Joint concurrency proposal, reverse AJAX, comet, Servlets 3.0 and indeed my own presentation the main focus was dealing with the fact that the world is no synchronous.
It is interesting that similer problems result in similar solutions. For example the N^2IO API uses the same form as the JAX-WS client generation. Although it does give some control over the thread for the callback which the JAX-WS doesn as far as I know.
All very cool stuff.