Voila...
Bluenotte is correct, the composition of the case was changed between the proto and production of the 1st pieces to Magnesium WE54 : 89% Mg still, but now 6% Yttrium and 5% Rare earth elements. (Yttrium is sometimes referred to as a rare earth too, but you can get better info at Wikipedia/google/whatever...this element is apparently often used for making Mg alloys stronger...!) Of course it goes without saying that the alloy is extremely strong and light. The surface treatment remains an electro-plasma oxydisation as per Titalyt but a slightly different process from what I can tell, called Miarox. Creates a very hard shock and corrosion resistant crystaline ceramic oxide layer of a few microns.
Weighed in at approx 58 grams. (uncalibrated scales)
Without further ado (but with apologies WRT photo quality) :
With flash...the true colour of the case is a very nice pure white
Cheers,
Rob