Preview at WWDC likely in June, followed by September launch.
Refurbished 7th Generation iPod Nano Now Available in Apple Online Store
The refurbished seventh-generation iPod nano models come with 16 GB of storage and are priced at $129, a $20 discount from the standard price. All seven standard colors of the iPod nano are currently available, although the special (PRODUCT) RED version is unavailable in the refurbished store.
Apple's refurbished units come equipped with the same one-year warranty that standard products offer and have been thoroughly tested for reliability. The units also come with brand-new batteries and outer shells.