What ever happened to the Android Accessory Development Kit? Wasn't this what ADK was supposed to be? Like, 2 years ago?
My best guess is that it was something of a gimmick for Google I/O. They never seemed well-supported by Google. An alternative to ADK is the Android USB Host driver support. It's like libusb: for phones with the right USB controller, you can write little drivers in Java/userspace. Here's an Android library you can use to talk to almost any Arduino, great for these type of "make my microcontroller smarter" application…
Then the only time I heard of anyone owning the ADK was my friend who worked at Google. It seems they kindof gave them out as party favors. I thought it was a great idea & wished it would take off but unfortunately had to move away from Arduino anyway to focus on web engineering career and to this day(!) I don't own a smartphone.