There's action on the Leopard update front. We've been told by reliable sources that the next point release of Mac OS X Leopard (version 10.5.4) will be released on June 12th. This update will include the usual bug fixes as well as support for the to-be-announced Mobile Me service.
In addition, we have reason to believe that this update will also include support for a new piece of Apple hardware. What is this mysterious computer? We have no idea, but we're hoping all will be revealed during WWDC.