Google has confirmed that they've released the passage ranking algorithm. It should help longer articles rank for the different topics addressed in different parts of the text. For now it's gone live only in the US English search results. It will come for more countries in English in the near future, then to other countries and languages after that.
There are some early signs from both the SEO community and automatic tracking tools that there is a big Google search ranking algorithm update going on.
Official Google keeps silent as usual.
There is some evidence that a small unconfirmed Google Update touched down around January 26 - 27th. The signals came from both the SEO community and automatic tracking tools.
Define global CSS variables for global colors
Offline store purchase system implemented