The layout editor has been improved in a couple of different ways.
First, we've recorded what the most commonly set attributes are for each view (based on running some statistics over various open source Android apps.) The context menu now shows these most common attributes at the top of the menu, so for example if you right click on a Ratings view, you see this:
All widgets commonly set "id", "layout_width" and "layout_height", so those menus are always there. However, for a Ratings view, the numStars, stepSize, style and isIndicator attributes are often set so they are all listed here for easy access.
Second, notice the "Other Properties" pull-right menu above. This contains all the attributes available for this view, and it used to be one giant alphabetical menu which was difficult to navigate (though a scroll-wheel helps). Now, the menu is itself divided into multiple sub menus:
Third, we now include submenus for the parents of the selection. If you for example have a Button inside a LinearLayout inside a RelativeLayout, and you right click on the button, your menu will contain this: