See: http://videos.webpronews.com/2009/11/13/matt-cutts-interview/

The good news is that the Google Caffeine launch will not take place early in 2010 to keep Webmasters happy over the holidays.

It seems to me that Barry Schwartz from searchengineland.com has hit the nail on the head in this article: http://searchengineland.com/site-speed-googles-next-ranking-factor-29793

Conclusions
This change is likely to be a very small part of the Google algorithm and unless your site is really slow and surrounded by other competing sites that load very quickly I don’t believe that most people will see a change in how their website is ranked.  The message is if it isn’t broke don’t fix it.

If you do want to improve your site load speed, check out the following sites:

http://www.webpagetest.org/

http://code.google.com/speed/ or http://code.google.com/speed/page-speed/

The following video explains how to improve your website performance with Page Speed:

Google state that “Based on the success we’ve seen, we believe Caffeine is ready for a larger audience. Soon we will activate Caffeine more widely, beginning with one data center. This sandbox is no longer necessary and has been retired, but we appreciate the testing and positive input that webmasters and publishers have given.”

So what is going to be different:

• It looks like the results will be returned much faster
• It may change the Search Engine Results Pages (SERP’s) but supposedly not by much
• Google will get better and better at prioritising Breaking News
• Mashable think it means a tough time for SEO’s (see link below)

While the sandbox was active Mashable reviewed it here: http://mashable.com/2009/08/10/google-caffeine/

This is What Matt Cutts had to say back in August 2009: