Unfortunately, even test samples won't be available until late summer. I have been waiting awhile for its release, since I purchased a D1 two months ago.
Regardless of technology, I highly doubt that any "super-zoom" is ever going to match the quality of a prime lens in the 300-400mm range. So, I think the 80-400 will be no different. It will be nice addition for people who don't want to haul around a ton of different lenses in an enormous bag, thats about it.
All in all, I can't see the justification in buying a $2000 80-400 5.6 lens when you can buy the infamous 80-200 2.8 AF-S for under $1500.
To most people, the sky is the limit. To those who love aviation, the sky is home