For those interested, I just received mine. It is clearly a counterfeit, stolen off the production line, or perhaps they were defects that were tossed and "repurposed". There really is no way to know.
I say that it is clearly one of the above because of what I know with certainty now that I received one: First, it comes in a Jack Wolfskin plastic bag. Second, it says Jack Wolfskin in two places on the actual garment. And Third, the tag that came on the jacket is the official red and back Jack Wolfskin tag stating, "At home outdoors in wind and rain - JACK WOLFSKIN OUTDOOR APPAREL is your reliable partner in every situation........" in German, English, French, and Chinese. The tag even points to their official website of www.jack-wolfskin.com.
As to the actual wind shirt.... the thing is light and of seemingly very high quality (without being tested in the field). I got an XL and it fits me. I'm 6' and 160 pounds and usually wear mediums in nearly everything. It is very light and very breathable. The cuffs, entire bottom, and hood has elastic banding to ensure tight fight. The stowaway hood is nice but a little awkward when deployed. It seems very breathable. There is a zippered chest pocket which is a nice feature and the full-length zipper seems like it's decent quality. All in all, I gotta say this is going to me goto wind shirt next summer. I'll be testing it out this winter for its wind protection because it almost seems too breathable.