Apherical optics used on all elements except for front SSC coated element
Pro quality optics on a par with L series lens quality
Robust design with build quality equivalent to L series lenses
Image intensifying optics used in front element of lens
Lens feature...
According to:
http://72.14.235.104/translate_c?hl=en&sl=zh-CN&tl=en&u=http://www.nphoto.net/news/2008-09/05/91147ad876119d17.shtml&usg=ALkJrhiWOM-n-ewqrb8rYvR4ztUeMKUyFQ
"on September 23 will be held in Shanghai in 2008 autumn new conference"...most likely will be announced on the same day...