Well, that's what I'm working on but please don't ask me for an ETA.
Since my time for PhoCo is very, very limited yet, this could take a couple of month.
All I know by now is: You'll need Windows Mobile 2003 SE (or newer) and you'll have to have a ActiveSync connection between your CarPC and your phone (either Bluetooth or cable).
There will be a service running on the mobile which will communicate with PhoCo.
What I don't know by now is which features will be supported and which not.