Up it is time. As much as nephlem is just around the corner and will be 20% faster clock for clock may of us forget the teething problems, the good boards will not be out for another 6 months after the release and prices will be high. So while many will grab the latest right now until the release is time to grab $200 Q6600's! you will also note that mobo prices are not droping one bit and ddr3 ram is holding steady.
so if you have a P975 or P35 or x38/48 board grab a Q6600 or Q6700 or Q9450 and just go! it will keep you running for at least a year until intels new stuff settles, plus I don't see a big rush for the new stuff as intel is also releasing a new platform and socket which will recieve ( like 775 ) a slow acceptance.