TUAW got a note, that Apple is preparing a system update for Mac OS X, namely 10.5.4. Incorporating in this update are changes to the .Mac services and integration for new hardware. What could that mean? The update is sayed to be released on June 12th. 

Source and more info: TUAW

With all the fuss about a new 3G iPhone to be announced at the WWDC this year, there is a new rumor spreading that Jobs & Co. might show off a demo of the next iteration of the Mac operating system, namely OS X 10.6. With the three major tracks being announced earlier this year, of which one of the three is Developing for Mac, there could be a good chance that we see a sneak peak of the new system version.

By the way, TUAW is promising that Mac OS X 10.6 shall go Gold Master at the end of this year, and go public on January 2009.

Apple gave out an official statement after the US stock exchange market closed yesterday evening, that they will postpone the release of its upcoming operating system Mac OSX 10.5 Leopard to October and not as previously stated at the World Wide Developers Conference on June 11.