Thanks. The Airport Extreme doesn't purport it on the box either, but it works with AirTunes. I think the info on the box is intended as a summary.
In any case, it might be a good idea for the geniuses at Apple to identify some functionalities that their target market finds popular and just include it as a standard item in new products. For example, the auto industry figured this out years ago by including power steering and air conditioning in virtually every new car.
In fact, the cost of producing is about the same either way, so why not lean towards enhancement to keep people that think "outside the box" happy.