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Caffeine was supposed to be rolled out after the holidays. So it appears to be delayed for some reason. The Google spokespeople are silent.
Duplicate Content - I believe with the new infrastructure that Google will be more able to detect duplicate content. So nows a good time to clean up duplicate content issues that your site may have.
I believe this is what the posters above are referring to.
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Caffeine is still months away. MC posted a comment on his blog last month:
http://www.mattcutts.com/blog/good-seo-tips/#comment-499543The short answer is that Caffeine is still live at only one datacenter. Things are on track though, and we expect to roll out Caffeine to all data centers in the coming weeks/months.