I've done a lot of research on this. I'm always looking for new deals on Komplete packages. What it comes down to is that 7 is still generally around the $500 price range and rarely below (unless you look on Ebay) and 6 can occasionally be found new for ~$300... and I mean very occasionally. Komplete seems to be one particular product that never permanently price drops. (Even pre-6 packages are still very expensive where you can find them, if not more-so than the current ones.) If you pay $500 for a Komplete package, you can bet your hat it will stay that price almost forever except maybe for a short time right before they release the next one, which for now ain't gonna happen for a long time. (They're still acting like 8 is new...)
My advice is that if you have the money and you really feel like you can utilize everything in there well, get it. It's not worth waiting month after month for a price drop in a way where you'd save $200 when you could just make that much again by then anyway.
As for when K9 will come out, there's no way to really know. I wouldn't count on it being in 2012.