One thing to add that I like a lot about ICS in car mode... when someone texts you it pops up a notification on screen and prompts if you want the text read aloud or not. Must be something custom to Motorola? I used to do this exact thing in GB with Tasker, now I really don't have a need for Tasker anymore since the Moto Smart Actions does everything else I need.
One other thing, has anyone installed the Google Now apk with success on Bionic ICS leak?
[MOD] [4.0+] [UPDATE 08/08] The Google Now for ICS Project [APK AND ZIP] [ARMv6&v7] - xda-developers