WebProNews spoke with Google's Matt Cutts out at SMX Advanced today. He talked a little about Caffeine, which Google just announced is complete, nearly a year after its initial announcement at SES, when Matt also spoke with us about it.
Caffeine, it should be noted, does not change how Google ranks content. It's all about the speed at which Google can index content. Cutts says you'll start seeing fresher results. This is separate from Google's real-time results. You'll see fresher results outside of that box as well.
He compared it to having a limo waiting for you to take you where you want to go when you arrive at an airport, as opposed to standing around waiting for a bus to pick you up (the bus would be Google's old system in this analogy).
Caffeine allows Google to do a larger amount of indexing, with the capacity to scale it up much more. It helps in letting Google add richer data to go along with other data, meaning not just links and anchor text, but any info Google deems useful.
Cutts also discusses the recent "Mayday" update, video sitemaps, and more.
You can read more about Caffeine here.