I've been reading about new APIs and services available in the new Android 4.4, KitKat, release. It looks like this release is another big step forwards with the platform UI design. Probably the biggest user-facing change is the toning down of the Holo blue colour throughout the system. The system status bar, for example, no longer has blue icons and the Holo blue glow for touch feedback is gone from buttons and scroll edge effects.
To get a good overview from design point of view to the new platform device the best source is the latest episode of Android Design in Action (ADiA). The Google's team explains many of the platform highlights with examples.
Watch it on YouTube: