The Goog has implemented a lot of improvements and tweaks the Android platform in this release, detailed extensively over at the Android Developers blog. But here's a snippet of what developers can expect with the SDK/NDK, which is available now:
Simplified user interface
More "intuitive" text input plus a re-designed keyboard with multi-touch support
VoIP calling support
Video calling support via a front camera
Cut-and-paste: one-touch word selection
NFC support
Application control manager
Updated video drivers and other enhancements for improved gaming