Apple Insider reports that Apple's aging tower computer is seeing a drought of in-store availability with many stores quoting new stock shipments on June 12, which could mean that a refresh of the long-in-the-tooth PC is imminent and may be announced at WWDC next week.

The pushing back of availability, first discovered by MacRumors, adds fuel to a bonfire of rumors that say the tower will be receiving a long-overdue refresh at Apple's WWDC next week. Even flagship stores that regularly boast large on-hand inventories like Grand Central Station are supposedly out of stock of all Mac Pro models. The same location will have the Server version of the tower in stock by June 9 while all others will be ready for pickup on June 12.

  Mac Pro in-store pickup inventory slips ahead of WWDC