there is an adapter that can be used for the old style dock connector. There are thousands of aftermarket accessories for the iphone, all utilizing that old connector. I wonder how many people will buy the i5 thinking that they can keep using their old accessories, only to find out that they have to use a new adapter that just kinda looks out of place. sure the adapter will work with some stuff, but others just can't have the same functionality with that adapter sticking off the bottom of it.
For those who have purchased spare chargers and cords, the adapter will work fine. However, for those who purchased those expensive, but popular, speaker docks or the less popular extended battery packs, the adapter won't work well with it.