After talking to my sister's friend's boyfriend's cousin's thrice removed uncle who works at a distribution plant that maybe-kinda-sorta receives products from a guy who eats lunch at the same restaurant as a guy who knows someone from Tom Tom, I can tell you with 100% certainty that the car kit is going to sell for $59.99US.
Oh, and I also heard that the Apple Tablet is going to come in hot pink and be released next week!
To be fair to him that is similar to the price that was rumoured on here a few weeks back (also included the app).
So if it is true:
£100 for app and dock
or
£60 for app only
makes the dock £40 which seems quite reasonable to me considering the features it has
just my 2c worth