In iOS7 translucency is key to indicating hierarchy on the UI to the user. However in Titanium SDK 3.1.3 so far I have only seen evidence of translucency supported on the TabBar, Toolbar, and Window Navigation bar. This is not thorough enough to work with Apple's guidelines.
For example if you look at Safari in iOS7 you will see that popover windows with TableViews in them are still fully translucent (see attached screenshot for example). But in Ti the TableView is not translucent.
Best practice we should also be able to layer Views or Windows and have them appear on top of content, with the content underneath showing through. This is not currently possible as far as I am aware.
This ticket is to get translucency supported on Views, Windows, Tables and other elements.