The latest addition to the SEO zoo is a hummingbird.
The algorithm change was announced in September 2013 but went live a month earlier.
Searchengineland has some useful background information:
FAQ: All About The New Google “Hummingbird” Algorithm
Hummingbird’s Impact On B2B Sites
Apparently this release will improve Google’s ability to predict a user’s search intent.
Conversational search has been improved.
Looks like Google+ might be another factor to add to the 200 items Google looks at? Search Engine Journal says:
Apparently the advice remains the same: develop original, high-quality content.
See Searchengineland’s SEO success factors.