JSR 203 is basically what Sun didn't get finished for 1.4's version of NIO. This is to be released in Java 1.5.
"Its major components will be:
1. A new filesystem interface that supports bulk access to file attributes, escape to filesystem-specific APIs, and a service-provider interface for pluggable filesystem implementations;
2. An API for asynchronous (as opposed to polled, non-blocking) I/O operations on both sockets and files; and
3.The completion of the socket-channel functionality defined in JSR-51, including the addition of support for binding, option configuration, and multicast datagrams."