Ha! Just noticed that the preview is more than a year old, with no actual review yet. Glad I didn't wait for a review before buying mine! Here, I'll save you the trouble:
The Nikon D4 does everything you'd expect from a $6000 workhorse, and it does so extremely competently and reliably. The fact that it's also a pure joy to handle is the icing on the cake. If you're even remotely considering a body in this league, just buy it and be happy.
No charge for that one, DPReview ;-)