Dropdown navigation menus, in previous versions of Genesis were handled with the Superfish script. This added a CSS class to the navigation menus that could then be used to create sub-menu indicators — like arrows. But now with Genesis 2.0, dropdown menus are handled solely with CSS — a decision that we at Bourn Creative are very happy with and prefer. The only issue with this new approach is that the CSS class used to add drop down indicators is no longer added automatically to the navigation menus.
Earlier this week WordPress 3.7 was released, and besides the much-hyped auto-update feature, WordPress now automatically adds a class to any navigation menu link that has a sub-menu. The new class is .menu-item-has-children. This simple change will make styling dropdown menus much easier for theme developers.