Might there exist in the future a car dock for the Karma?

A couple of extra ones exactly as supplied with the Karma would suit me fine, but without the power supply brick - PLEASE, PLEASE, PLEASE - as James Brown once said!

I've been using the Karma with the 4.5 volt car adaptor that came with my CD walkman, and it works just fine - not - as Tony rightly points out that it's a problem with 14 hour battery life.