Rolling Stone blog was the first release information about this. Read it here.
Fender has posted a teaser video on Facebook.
There is a frame in the video with what appears to be close ups of Kurt's actual Jag.
Watch teaser video here.
While it is not an exact replica, it's the closest that's ever been produced by Fender.
Here is a photoshopped version with the pickups placed correctly, angled bridge, single string retainer, right-handed strap peg, and the extra hole on the trem.