walkman - 6:24 am on May 13, 2010 (gmt 0)
that can be a codeword for a trying to fine tune it before taking it live. I noticed that in Google Canada what I consider Caff is live, in US it isn't, at least not for a significant amount of time.
So my guess is, like yours, that Google is using the data from those exposures to see how to improve it. I think we can agree that something is not going as planned, caffeine was supposed to come after the 'holidays,' and Google would announce it if it was live.