Here's my procedure when a new camera is released:
1. My wife "gets" it for a Christmas gift. In my case, it is too complex for her to use, so she lets me use it to take the family pictures; but I don't have to worry about jewelry! --this has worked for the past two Christmases with the D200 and D300; and guess what she will be given THIS Christmas!
2. It's important to keep a backup camera. My D70 was joined by the D200 and all was well. When the D300 arrived, my daughter received the D70 and accessories for a Christmas gift (the gift that keeps on giving!). --When the D700 arrives, I will have fully populated the food chain--my daughter will give my son the D70 for Christmas, she will get the D200 (she bought her own 18-200 lens) for Christmas, and my "wife" will now have a D700 for Christmas, with a D300 for backup!
3. Since I have run out of kids, when the D800 arrives, my son or daughter will have a backup camera. The backup food chain will be fully populated with the arrival of the D900!
So, that's what I plan to do with my "old" camera!