Before the holidays, Google made it a point to let everyone know that Caffeine won’t be rolled out until after the holidays. January at the absolute earliest. They did this because Google didn’t want to shake up everything during an important time for business.
They let everyone know about its intentions at PubCon in November. Recently, Google’s Matt Cutts posted a video running through his presentation from the event on his blog. Through the slideshow, it covers how much more than just Caffeine. It’s definitely worth checking out