Whatever these anomaly type objects are, my guess is that they were always present sat way up there in the air, and we were just never intended to witness them. Like silent scouts. Is it an attempt at a soft disclosure? I have no idea and their collection of data is only hinting to us as to what these things are - the very real impact is there are going to be a lot of very concerned people out there when they can't even realistically categorize just how these things are even staying in the air.
Either way, as the Pentagon briefing stated...
This is the first time within the United States or America airspace that Norad or United States northern Command have taken kinetic action against an airborne object.
Those words can either end up as absolutely nothing, or they could well go down in the history books.
Building the future, and keeping the past alive - are one and the same thing.