Google is experimenting with a touch-first full screen app launcher for Chromebook that it hopes will bridge the gap between traditional web-based apps and Android mobile apps.
To see it in action, you need to enable the following flag via the address bar:
Then, press the Search key, which works a bit like the Windows key on Windows PCs: It displays the app launcher, instead of a Start menu.
Beaufort provides a nice video rundown of the new app launcher as well. From what I can see, this UI should work well for keyboard and touch users. It looks pretty sharp.