As Outer-Neptunian Planets, these bodies represent cosmic forces as they step-down(up/into) the Solar(personality/self) consciousness from outside/beyond our 3D realm.
If you Take a look at the planets from a consciousness perspective: the Sun, Moon, Mercury and Venus all represent aspect of the Solar(self/personality) consciousness. Mars - Saturn represent "the World" the people/society in which we are a part of in an emediate way. Uranus - Pluto represent the outer-world beyond our "village" as well as transformative forces that change/ direct our world (and us) into new modes of being.
So what do these "new" planet have to tell us in this context? I think it may have to do whith what is alien in many cases, other worlds that we can now connect to, ETs and UFO quite literally, even.