Here's an interesting little rumor that seems all too plausible: Peter Kafka at All Things Digital says sources are telling him Apple will announce a new mobile ad network based on its Quattro Wireless acquisition on Thursday at its iPhone OS 4 event, a report that jibes completely with what we learned about the iAd / AdKit framework present in the iPhone OS just last week. Kafka also says that Google will undoubtedly cheer the move on, since it's trying to convince the FTC to approve its $750m AdMob acquisition -- the presence of a formidable competitor like Apple in the mobile ad space makes the buyout seem more like healthy business and less like "evil monopoly that owns every ad on the internet and is stalking innocents for their flesh with Google Buzz." Our guess is that Apple will give developers a standard way to place ads in their apps using a new OS service and split the revenue 70/30, just like paid apps in the App Store, but that's just a shot in the dark -- we'll see what happens on Thursday.