It should be noted that the official apple docks have a 3.5 mm jack built in them while only connecting to the phone via lightning.
THE SIGNS WERE THERE ALL ALONG!!
While I don't know, but I am reasonable sure the old 30-pin docks did not have the 3.5mm jack, for the simple reason that it did not NEED it. Why? Because you could dock it, and yet use a 3.5mm jack at the top of the phone. Don't think that's a sign to anything besides poor port placement.