I think if I were waiting this long on the D300S successor to come out to upgrade, I would continue to wait a little longer. If not, it's sort of like a Honda Accord owner wondering if they should buy the latest Honda Civic that seems to have taken on a lot of the Accord's features, rather than wait for the next generation Accord to see what it offers, and then make a decision. I just moved from the D80 to the D300S late last year and probably haven't even realized 10% of it's potential yet, but I have to say I do like the D300S's size, build, features, and ergonomics quite a bit better than I did with my D80. Assuming there will be a D300S successor in the DX format (which I can't imagine there won't be), my guess is that there will be a comparable difference between it and the D7000.

Mike