If you want to take pictures, don't wait and certainly don't worry about 6 or 8MP. I recently bought a Coolpix 8800. It couldn't focus in poor light, had no manual focus that worked and was a slow performer in every way. Basically it was fancy junk. I returned it and bought a D70. I have never had more fun with a camera! I'm so happy with it that I could easily wait for two more generations before getting a new body to replace it. 8MP just won't make enough difference. Meanwhile, I've started getting some lenses and it's just a lot of fun. And yes, the D70 takes better pics than the 8800. I have the samples from both. Also of note, most comparisons between the D70 and 8MP canon 20D rate the image quality the same or so close it makes no difference. A 12 or 14MP sensor with a lot less noise would probably get us all to take notice, but that's a ways off. I think you'll be seeing people shooting with D70s 5 years from now. Smarter shooters will have spent on better glass before upgrading a camera body, as they all did in years past with film.
Any 6 megapixel DSLR will deliver better image quality than the best 8 Mpix digicam. There probably will be an 8 Mpix (or thereabouts) DSLR from Nikon announced next month, but it's more likely to be a D100 replacement.
Megapixels aren't everthing. Better, bigger sensors in DSLRs offer much lower noise so that detail isn't lost to agressive noise reduction.
I just got my second/backup D70, while I'll wait for the D100 replacement. I got my first D70 within days of it was released, and I'm still impressed with it now, compared to the other models. It has features that far exceed the D100 and even the newer Canon 20D. Which I was tossing as alternative, but I can't just resist on the image quality the D70 produces, and the lower prices. The 8MP makes no difference between the 6MP, so if that's you concern I think that's the least of your worries.