What does it mean when someone says the SERPs are old?
I get new pages in the SERPs every time we post a new article. It's usually on the first page too. I don't see a stop to the pattern of Google constantly updating SERPs.
And like steveb, I don't expect a lot of changes with any new infrastructure. I do suspect that some webmasters here will see a big shift at the individual site level, but I wouldn't expect the masses to experience mass changes. If a lot of webmasters are waiting for Caffeine because they think it's going to be their big break, I think a lot of people are going to be disappointed.