Apple's yearly developer conference should see iOS 8, OS X 10.10, and likely some hardware.
iPod Nano, Mac Mini Announcements This Month?
Models facing shortages are reported to be all versions of the Mac mini and the iPod Nano as well as the HiFi. The site notes that their sources indicate that the Nano will be shipping again as early as next week, indicating that if an update should occur, it may occur as early as next week.
Other models mentioned facing a shortage include the entry-level combo drive iMac, the mid-range MacBook Pro, and the entry-level and black MacBooks.