Looks like Google added specific remote features to its next release of Android.
"API level 18 also adds support for AVRCP 1.3 (Audio / Video Remote Control Profile) which essentially enables compatibility with things like a car head unit, AV receiver, or so forth. This enables the device to control commands like play or pause, as well as metadata such as album artwork, artist, name, and status of the music. This enables much better compatibility with car audio and so on. Interestingly on the last slide from this session the date for API level 18 is given as coming in "a few short months."
I presume since this is stuff in the API, it will take developers a while to take advantage of the new feature set.