I recently upgraded from my Nikon D90 to the D7000 during the Thanksgiving "Black Friday" sales, when B&H Photo was offering the camera with the 18-105mm kit lens along with a free camera bag and SD memory card for a very attractive price.
I've only begun using the D7000, which has a learning curve involved since it's somewhat more complex than my D90 (the rockynook book, "Mastering the Nikon D7000" is a very useful reference source). So far I certainly don't regret my decision.
As far as the possibility that Nikon will introduce a new DX camera to replace the D7000, I don't think that will happen until later in the year. When it does I'm sure the new camera will have some attractive features, but the present D7000 is really a very capable camera.
I also wouldn't be too concerned about Nikon discontinuing the D7000 anytime soon, they still have the D90 listed on the US website as a current model.