The new lens uses an optical construction of 11 elements in 8 groups (including three ED glass elements) that minimizes vignetting and creates attractive bokeh. It weighs less than 20 ounces offers a minimum working distance of about 24 inches.
The WR rating means that the lens is weather and dust-resistant and can work in temperatures down to 14°F. The FUJINON XF90mmF2 R LM WR will be available in July 2015 for $949.95. Check it out here at B&H Photo.