Microsoft has set November 30th as the offical release date for Vista, and its Office 2007 line (Including Exchange 2007). The November date is for business customers, and the full consumer release of Vista will be January 30th 2007.
One interesting factoid is that the build number will jump to 6000 on this final release. This is to reflect the fact that Vista is the 6th major release of the Windows operating system.
You will pay more for Vista too. Here is the pricing we have from Microsoft so far:
Windows Vista Home Basic $99.95 (Upgd) $199.00 (Full)
Windows Vista Home Premium $159.00 (Upgd) $239.00 (Full)
Windows Vista Business $199.00 (Upgd) $299.00 (Full)
Windows Vista Ultimate $259.00 (Upgd) $399.00 (Full)
I still have not been able to determine what version(s) of windows you may upgrade from. Go here to get a list of the features that each version of Vista offers.