So why "exquisite"? Well, first it is the only Adeptus Mechanicus figure from the period that actual matches this piece of artwork from the original Rogue Trader rulebook:
A second piece of AM artwork from the rulebook does resemble a figure that made it into production:
And here's the figure by Bob Olley (image from the Collecting Citadel Miniatures wiki):
Now don't get me wrong, I love Bob Olley's three Rogue Trader AM from the time, but it's great to see this unseen interpretation of the facial details of the AM. Which brings me on to the second reason why I think this new figure is exquisite - the fine details (particularly the head):
How's that for a skull? Sinister! The tubes are visible too. Can you imagine what this would look like in the hands of a skilled painter? Here's another side-view that illustrates the extent of the hood, and the size of tome being carried by the AM:
The new AM is a little smaller, but then perhaps that's appropriate for the figure in question?
By the way, Bob Naismith thinks this is one of his sculpts.