Rasputin - 4:40 pm on Apr 4, 2012 (gmt 0)
I've seen the full post, it says for example:
Remove deprecated signal from site relevance signals. [launch codename "Freedom"] We’ve removed a deprecated product-focused signal from a site-understanding algorithm.
Simplification to Images Universal codebase. [launch codename "Galactic Center"] We’ve made some improvements to simplify our codebase for Images Universal and to better utilize improvements in our general web ranking to also provide better image results
Personally I don't think that even with full explanations they provide useful information for webmasters (presumably the target of these posts) although I agree that some of the entries are slightly more informative.