There are no subtle hints from Apple about the release of a MacBook Nano or a netbook with a different name, but there sure is a sign that is significant enough to suggest that Apple is going to bring out an iPhone Nano in the future (an addition to the list of rumors attached to this product).
XSKN, a silicone casings maker based in China, has a section for its casings where it has listed the iPhone Nano along with the iPhone 3G and the 1st Gen iPhone -