It's important because it's on the iPhone. If it were on the Droid it wouldn't matter. Funny how that works. Personally I don't give a damn about that feature, but I would really love a built in turn by turn free GPS. Now that's useful. Flash support would be great too.
But that's what Apple have always done. We had those 3G phones with video chat in the UK 5+ years ago? They were ****. You know that if it's incorporated into the new iPhone then it's likely a really slick implementation and finally in a state where people might care.
So I'm guessing it's not, "important because it's on the iPhone," it's, "important because it'll finally have been done properly."