Robert_Charlton - 9:27 pm on Oct 4, 2012 (gmt 0)
That's quite a list. Here's a quick and very partial overview of some of those that jumped out at me which I feel are significant.
Note mention of "trusted sources" in several places, emphasis on ability to group and identify important phrases (onpage and in queries), and also emphasis on local context (and perhaps by extension, user intent)....
#82862. [project "Page Quality"] This launch helped you find more high-quality content from trusted sources.
#83197. [project "Autocomplete"] This launch introduced changes in the way we generate query predictions for Autocomplete.
LTS. [project "Other Ranking Components"] We improved our web ranking to determine what pages are relevant for queries containing locations.
#83443. [project "Knowledge Graph"] We added a lists and collections component to the Knowledge Graph.
#83442. [project "Snippets"] This change improved a signal we use to determine how relevant a possible result title actually is for the page.
#84394. [project "Page Quality"] This launch helped you find more high-quality content from trusted sources.
#84460. [project "Snippets"] This change helped to better identify important phrases on a given webpage.
#83901. [project "Synonyms"] This change improved the use of synonyms for search terms to more often return results that are relevant to the user's intention.