this has been confirmed. listening to slacker or pandora over 3G no longer sounds like dog crap. ive been waiting for this fix for a while. I always like listening to music in my car from internet radio. I'm glad to have more options then just Last FM now.
Another great thing I have noticed is that the signal doesn't seem to get interrupted as easily, so something may have changed with the caching. I had stopped using Pandora on my drive home because of the bad reception I got in some areas. Last night I was able to drive home without any interruptions!