Google Chrome OS may be Ubuntu under the hood, but it isn't Ubuntu with Gnome. It will be a ninchi. My mother won't like Chrome OS. Maybe other moms like Chrome OS. If somebody asks, it does everything Ubuntu would do except for the GUI aspect.
…Supposedly, Google’s Chrome Netbook is expected to be made by Inventec and will be shipping 60,000 to 70,000 units in their initial shipment. After this Chrome notebook is announced, the source that spoke with Digitimes reports that Acer and Hewlett-Packard will follow up with products in December. Both follow-up products will be manufactured by Quanta Computer.
I doubt that Chrome OS can outdo Ubuntu in the desktop market anytime in the future. It may make it into the top 10 linux distros, but it won't have the huge impact like Google says it will.