VIA has a dual-core Nano up it's sleeve, which is expected to make an appearance at next year's CES in Las Vegas. HP has earned the rights to produce the chip.
The same sources said that it already has design wins based on the microprocessor, with HP possibly stepping up to the Nano plate.
While several review sites looked at the existing single core Nano some time ago, those reviews were based on the desktop version. It's likely that the notebook bins are coming along in the very near future, and they are pin compatible with the C7-M CPU. We have, as yet, no details of the technical specs of the dual Nano. 