Metal: Not a new Graphics Engine. It's been on iOS for two years.
iPad:"Android" hasn't had split screen. "for a while" Samsung has had split screen for a while but with little third party support. The iPad split screen implementation should work for all apps that were updated to support iOS 8's screen size classes.
CarPlay: You have to buy a new radio if you don't already have a car that supports it. It's been out for a year.
"Being that this cost more than Netflix or Hulu and you get less data traffic, it doesn't make sense."
Yes because Hulu and Netflix both have licenses for all of the most popular movies and tv shows. Like Apple Music will probably have licenses for the most popular music.