Not entirely sure what to make of it but I am seeing an significant number of empty Apple ad units: "Test Advertisement: This confirms that test ads are running correctly". It also (potentially) confirms that iAds is lacking advertiser supply? It is strange to see big, black, empty ad units across popular apps... particularly with a bold Apple logo beside each. You would think that, at a minimum, Apple would not display an ad unit or would run default ads to iTunes (and deliver a rev share). This strikes me as a bizarre user experience and a very public reflection of the iAds business:
