I'm posting this here on the tail of an old thread which is probably a mistake. And just for good measure, I'm a D7000 owner and never come here. That said, I'm interested in following any and all thoughts on when or if the D400 might appear and believe this falls in the D300 forum.
That's not to pooh-pooh the D7100 either. The D7100 with the new AF system and 24 MP would probably satisfy 96.4% of my bird/wildlife needs. That leaves a pro-DX body itch that I would like to satisfy. I am committing to maintaining a DX body and if there is a D400 in Nikon's future this year, I would like to hold off and be in a position to consider it.