The only thing I've found is this, which mentions a Wall Street Journal article. Unfortunately, those articles require a subscription.

Apparently, the delay in the first launch of the Falcon I is not due just to technical difficulties. The article indicates that because of the dispute "the Air Force hasn't given the green light for SpaceX's first launch, which has been rescheduled for sometime next year."

Also, the pintle system wasn't a great bonus to the project anyway. The article says Elon Musk

now regrets choosing the pintle technology -- but not because of the legal problems it spawned. Contrary to Northrop's claim that trade secrets enabled SpaceX to develop an engine in mere months, SpaceX hasn't achieved the performance it seeks. "We will get to our objectives, in spite of the bloody pintle," says Mr. Musk, who is already looking to scrap the part for another engine technology.