If it comes to US, I don't think it'll be expensive to add on, Probably just a $10-$15 a month charge.
Similar to how MB charges $14 a month to use their MB apps (which is dumb because BMW apps is $250 on time, but thats another topic)
Anyway, i think this is a cool idea, i remember watching the prototypes years back. Its almost here.
WHO'S THE BOSS