In News that should shock no one, Microsoft's Steve Ballmer is dampening expectations about the release date for Vista:

The operating system was due to be launched this year but in March the company said it wouldn't get broad release until January 2007. Ballmer said Wednesday that the planned January launch may slip further based on feedback from a beta release program and the product road-maps of hardware vendors.

That's actually a smart move, getting out in front of a potential delay like that. With feature driven releases, timing is always hard. We do timeboxed releases of Cincom Smalltalk, but the consequence for that is that the delivery of any given feature is always up in the air. You get predictable features, or a predictable date - you don't get both. All too often in this business, you get neither :/