This is unfortunately just a renamed Lilium asiatic 'Mapira' :
http://www.brecks.com/product/...
It says: "Botanical Name Lilium asiatic 'Mapira'" under product details.
So this is certainly not a new variety and if you want a "black" lily you could just as well look at some of these instead:
I think it's fair to say that temperature and sun exposure will influence the blackness in these lilies as well, as this is usually the case with lilies anyway. The database certainly holds a great variety of colors. I will say that I thought my own 'Landini' had significantly different blackness for the two years it has grown here.