They unfortunately did not have a full-sized Elise at the show in Graphite Grey, so all I have to go on is the scale model, but in my opinion the TVR in your picture is much darker than Lotus's Graphite Grey. Graphite is not dissimilar from the pictures I have seen floating around of Gunmetal, but _is_ slightly darker than the Gunmetal. And, compared to the picture of the TVR, Graphite Grey is much more metallic and "shimmery"; it really picks up the light.
I didn't ask about the Esprit floor model at the show, but according to at least one poster, they were told it was Storm Titanium, but to me looked darker than the scale model Elise in Storm Titanium. I mention this because with the horrid lighting conditions, plus the difference in perceived color between a scale model and a full sized car, it's a little difficult to be precise in describing the color- I'd love to see Graphite Grey in person, in daylight...
I have heard that there were a number of hi-res pictures on a CD in the presskit, and I'm hoping that as those filter out we might get some reasonably accurate glimpses at more of the colors under controlled lighting conditions.