Here you go - you can now get an updated version of the Sanaa DukaPress Theme.
Basically, it is a step towards making DukaPress and Sanaa more user-friendly. Before today, you just had to create a different page for every new category of products if you wanted to show them using the Grid view.
With Sanaa 1.1 we changed that, magically. The Grid view now shows up for every category without the need to create separate pages and then insert the Grid view shortcode. Neat, eh? Enjoy.