got this from the cupcake post. its at the bottem it looks like a refrence towards being able to theme or change skin of phone.... look>>>>
* New features
o Enable handset manufacturers to extend the Android SDK with add-ons. SDK add-ons will include:
+ system libraries to let developers use additional APIs provided by handset manufacturers or from other 3rd party vendors that handset manufacturers chose to include
+ emulator system images, skins, and hardware configuration to let developers test their applications on their Android implementation