Adam Powell, Android framework engineer at Google:
In Android 4.0, Holo is different. We’ve made the inclusion of the unmodified Holo theme family a compatibility requirement for devices running Android 4.0 and forward. If the device has Android Market it will have the Holo themes as they were originally designed.
Less “open” for handset makers and carriers, but better for developers and users. This should be a significant improvement for the platform in a year or two, when most Android phones in use are running 4.0 or later.
★ Thursday, 5 January 2012