Sorry, but I really didn't mean for this to turn into a tech specs opinion post. Maybe I wasn't clear enough at the beginning, and if that is the case I do apologize.
The question I have is this; I have recently watched the new/second-hand price of my camera go down a few hundred dollars and I was wondering if anyone believes that with the release of the next in line, will my 60D drop in resale value again or would I be relatively safe to wait and sell when the new one comes out?
A couple questions/observations to that point:
Is the 60D your only camera body? If so, if you sell your camera before the announcement of a replacement, how long are you OK with being without a camera? Obviously, if your income depends on the camera, it's a different answer than if it's for enjoyment only. But even your enjoyment has value (perhaps not monetarily).
The 60D isn't an extremely valuable body new (coming from a person who has two 60D's and who is very happy with them). If a 70D is announced tomorrow, how much will used value drop on a 60D body? $100? $200? Let's say $200, just for fun. That means if you sell today, you can cash in on $200 extra. However, if you sell today, and a new body isn't announced as soon as you think/like, does that $200 cover the cost of renting/borrowing/buying a new camera if you have an immediate need? We're talking rumors and potentially vaporware here. Without a concrete, announced, and available product, no one can make solid recommendations.
A camera in the hand is worth more to me than one on the internets.