Preview at WWDC likely in June, followed by September launch.
Apple Online Store Down with New Look
Tonight's downtime is likely related to maintenance or other non-product tweaks, but notably the "We'll be back soon" graphic that should be quite familiar to long time Apple followers has been changed.
The original graphic (above) was on a sticky note and has been in place for many years. Every time Apple's online store goes down, visitors would be greeted with this yellow sticky. Tonight, we see a new graphic overlaying a linen background that has been popularized in iOS.
Apple has several product lines that are due for updates soon, including the Mac Pro and MacBook Pro. These overnight downtimes, however, are more typically related to routine maintenance rather than new products. The change in "We'll be back" graphic may foreshadow other graphical tweaks to the online store.
Update: The online store returned without any notable changes.