Theme updates tend to be fixes and updates to keep up with WordPress. Changes to layout are unlikely to be in future updates.
Pure has a different layout to our other themes. In fact if you resize your browser the menu changes position for different devices. This is responsive design.
Our other themes have menus positioned differently and some have move than one menu. Some also have dropdown menus, while Pure utilises a flatter menu structure.
Or if you had specific requirements a customised theme is also possible. If you know css and html you could create a child theme, or we can create custom themes for a small fee.