The new product lines have new colors: The light grey one is more affordable than stardard noctua brown, and the black one is for industrial customers.

Check out their new fans here, and for a quick comparison check out their product line page.

 

Prices and availability
All redux and industrialPPC models are currently shipping and will be available shortly. The manufacturer suggested retail prices are as follows:
redux 140mm: EUR 15.90 / USD 19.90
redux 120mm: EUR 13.90 / USD 17.90
redux 92mm: EUR 11.90 / USD 15.90
redux 80mm: EUR 10.90 / USD 14.90
industrialPPC 140mm IP52: EUR 26.90 / USD 29.90
industrialPPC 140mm IP67: EUR 29.90 / USD 34.90
industrialPPC 120mm IP52: EUR 24.90 / USD 26.90
industrialPPC 120mm IP67: EUR 29.90 / USD 34.9
Accessory sets: EUR 5.90 / USD 7.90