So, the .Mac servers are down for maintenance since last night and the new .mac replacement is ready to go. Maybe just a few more hours? We’ll see.

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