The site believes these are the processors that are used by Apple's new MacBook Air laptops. When asked about these chips, an Intel representative stated that the "N" denotes a customer-specific version of those SKUs:
When we approached Intel asking what these CPUs were, and the official line is:
“The ‘N’ notes a slightly differentiated, customer-specific version of those SKUs. Those slight differences require a signifier for our internal SKU management and ordering systems. The N is not a new subfamily or directly connected to a specific set of features, for example.”
This goes in line with what we stated above about customer-specific binning. Apple will no doubt be ordering a few million of these CPUs, so Intel is prepared to add an extra binning step just for the business.