Should I buy a D7000 now, or wait?

After doing a fair bit of research, I'm pretty sure I want to buy a Nikon D7000 as my first DSLR very soon. However, I'm not familiar with Nikon's release schedule, and I'd rather not spend a grand on a camera if an improved model is going to be released soon. Photokina is just around the corner: is there a realistic possibility that a D7100 will be announced by then?