here are the images from my visit to the new grand central terminal for the LIRR today. cleanest station i've ever been in (and likely i'll ever be in).
now we get onto the main concourse type area. it's quite nice in its current state without being full of shops and stuff. felt very open when i was there, and looking back at the photos the architecture is tasteful. reminds me of the original grand central concourse with a bit more of a modern feel.
when you arrive at the lower level it leaves you at a mezzanine type area, with 2 sets of tracks above, and 2 sets below. this image is of the one furthest from the entrance from the main concourse, but there is another set of 4 closer to the main concourse.