A lot of people have been saying that Google Caffeine has already been released ... And I disagree ... Not because of SERP Reasons (which is truly another piece of evidence) but because Caffeine is supposed to speed up Google search results drastically... If you go to http://www2.sandbox.google.com/ you can see that results are showing up 2x quicker than results on Google.com. Evidence: Look at these two screen shots.. The first is results from Google.com... The second is the exact same search on http://www2.sandbox.google.com .. Notice the Google Caffeine page loads in 0.07 seconds, Google.com loads in 0.16... If Google caffeine had already rolled out like some people are saying then Google.com result speeds should have increased... Thats my two cents.
I generally read people saying that parts of it are implemented, not all of it. I completely agree with your evidence though, it's definitely not entirely implemented yet, if at all.
Yes, i agreed that Google Caffeine is still under development but it is released, else you cant use it Or we should say that Google Caffeine is still in beta version, then it is accepted
I was reading about this, sounds good, they doubled the speed, added image to main keyword searches, time to do image SEO
I agree, However 3-4 weeks back It appeared that Google had released caffeine and must have had some problems and quickly rolled it back. As far as the talk about a partial release well that is impossible since this is an infastructure change it is all or nothing. I do see a change in an algo update that has been slowly rolling out and seems to have settled.