At various times the ground, once justa meadow kept in trim by grazing sheep, has been used as a venue for pigeon flying, hopping races and even an exhibition of archery by a tribe of Red Indians.
There's still a chance we're looking at an elaborate KIRF or an early engineering prototype that could change, but given that 9to5 Mac just got very similar images with black trim, there's a real possibility that we've just been given a sneak peek of what to expect from Apple later this year.