If it helps I emailed NorthStar yesterday on this very matter. They replied, very promptly, that the range will reappear in 'late summer'. They do not seem to have discontinued it and would be unlikely as they are adding to it. I think the 'mothballing' may be correct. Other ranges have also disappeared, for instance Great war Miniatures now only have WW1.
I have an order enroute (I hope) but post in Italy is terrible. I also ordered all of the books I felt relevant. I wish I had known in advance I would have increased the order. Thank goodness I am a slow painter.
Frank