Apple is beginning to exhibit signs that a notebook refresh may be close, previous reports have pointed towards Apple revising the MacBook in calendar Q308.
The Chinese publication, Commercial Times is now reporting that Apple has increased orders for "notebook-use printed circuit boards" by up to 2% for the forthcoming quarter (July - September).
In addition to this Mac Rumors is noting that Apple has told Best Buy that they will have limited MacBook shipments over the next two weeks.