The online Apple store
has been temporarily shuttered ahead of today's WWDC 2013 keynote
. Apple normally only closes the store midday when it's preparing to launch major new products. As such, the move may all but confirm expectations that updated Macs will be announced during the keynote.
It's generally believed that Apple will at least update the MacBook Air line, but the company may also be ready to update the Mac Pro and/or Retina MacBook Pro, if not necessarily at WWDC. More recent speculation has had the iMac getting an update, but there has been no firm evidence along those lines. Apple may want to move as many Macs as possible to Intel's new Haswell platform