Yes! You can select "Newest" as the default sort for your shop, the same as you do for your models.
Additionally, in the updated Shop Inventory, you can easily sort the display order of your models.
It would be this page:
https://www.shapeways.com/shop/inventory
It is the beta version, so if you find any bugs or have ideas for improvement please let us know as you explore it!
Last edited: Jun 21, 2012