These are exciting discoveries aren't they. The photographer, Ken Williams has posted several links on Facebook - causing something of a stir on the Prehistoric Society site.
I find it amazing that a site like Newgrange, which you might expect has been poured and picked over for decades still has unexpected and unknown beauties to reveal. The photography of Kevin is quite amazing too, I like a good photo (check out Land by Faye Godwin if you want some impressive landscape photography) and that guy has a real eye for a good pic.
Those aerial shots of the 'undiscovered' Newgrange feature with those causeway spaces kinda remind me of that German ritual site Pömmelte (lazily called the German Stonehenge).