Ahead of a "very busy fall" for Apple, Mac mini ship times on many Apple Online Stores have slipped to 5-7 business days.
Apple sometimes does have temporary product shortages of computers mid-cycle, but they can also portend intentional drawdowns of stock ahead of a product refresh. The Mac mini is a candidate for an upgrade to Haswell processors, and it is coming due for a possible update according to the MacRumors Buyer's Guide.
Article Link: Mac Mini Shipping Times Slip to 5-7 Days on Apple Online Stores, Possible Refresh Ahead?