I’m a big fan of getting things straight from the horse’s mouth wherever possible. In this case, here are the official questions from the House antitrust subcommittee (technically, the Subcommittee on Antitrust, Commercial and Administrative Law of the Committee on the Judiciary, but who has time for that mouthful?) along with Apple’s official responses.
This is surprisingly easy to read, especially if you are a regular Mac/iOS user. It’s chockfull of interesting tidbits.