According to a report over at Tabtech.de that managed to spot an unknown device in the result page of the GFXBench, Nvidia might be gearing up to release a phablet or tablet.
The device is listed as Nvidia Tegra Note Premium and scores just slightly lower than the Nvidia Shield in GFXBench. It feature Tegra 4 clocked at 1.8GHz and has a resolution of 1280x800 which probably points out to a tablet rather than phablet but everything is possible. It was running Android 4.2.2 Jelly Bean when it was tested.
At Computex 2013 back in June, Nvidia showcased a rather unique device that was used to demonstrate pressure-sensitive functions of a stylus and which might be the device that showed up in the GFXBench results. The 1280x800 resolution is not impressive and far off from what the competition currently has to offer, but then again Nvidia might want a cheaper tablet or phablet on the market.