BigA already commented the broader picture of what attracts eyes to the screen. But denying the newsworthiness of the new iPhone is unrealistic.
I did not deny the interest (it really isn't "newsworthiness") in the iPhone but (1) those people most likely get their "news" from online sources as opposed to TV news shows and (2) the iPhone stories I saw in my market were headline stuff (not really) and went on and on and on about the new (or lack of) features and the cost.
I will agree that particular story bears a mention but not headline nor feature.
43% of persons 13 and over have an iPhone, and are interested in news about new models and the regular enhancements to the operating system.
And I am willing to bet those same people have already received emails and flyers.
I think a safe bet is that there are more people interested in the iPhone than in Brexit or the status of the Paris Climate Accord.
I hate to say it but there are probably more people interested in porn than any of the above. But your comment raises a good point. The local and network news, AFAIK, has never done a detailed story on either Brexit or the Paris Climate Accords other than to give the president's opinion (which is in itself a tragedy). It might be a nice change of pace for the "news" to explain just how both of those issues will affect the average American. It doesn't need to be a feature story but one that gives the highlights.