I would like to add that waiting for a price drop is a fallacy... As the Yen goes up, prices WON'T come down. Yes, initial low stocks may have made prices artificially high. But now that it has stabilized somewhat, you won't see prices coming down or by much. Nikon dealers generally only have between a 10-15% margin on camera bodies. How much do you think they will come down by? In addition, as the Yen goes up (and the D800 is made in Japan too), the price may even go up (as has lens prices in the US).
With a 3 year product cycle before upgrade, each month you don't use this sensor technology while it is new is a cost. You could have used it and be on the top of current technology for that many more months.... imagine paying for the D700 at new prices just before the D800 product release? THen compound it with gear envy
Lenses will hold it's value better of course... which is why you can buy that anytime. It may not have dropped much in value but it has not gone up either.