'Retina quality' means that the screen at an optimum viewing distance, in this case 0.45m, your eye will not be able to distinguish between the pixels due to a high PPI (pixel per inch). Intel plan on using a 2560x1440 resolution on a 13.3" screen which compares to Apple's projected 2048x1536 10" screen on the coming iPad 3. Ultrabooks are Intel's response to Apple's Mac Book Air and iPad as a fully functional desktop experience in an ultra slim and ultra light format.
VR-Zone discuss how their chosen 16:9 aspect ratio chosen may actually restrict the usefulness of the screen compared to 16:10 or 4:3 ratios. Due to the HD boom from 2006, panels have been steered towards 16:9 ratios by makers as per high definition movies (and allowing the makers to create more screens by creating smaller cuts), where as for productivity, the extra vertical real estate can be a real help.
On the plus side, as portable technology demand better screen quality and higher resolutions. the more likely we will begin to recieve these benefits on our larger screens at lower prices.