Just when you thought you knew everything you needed to hit the top of Google rankings, it's all change. It's the first big upgrade to Google's search algorithm for a few years.
The good news, according to Forbes, is that you don't have to do anything new. Just keep producing original, high quality content.
Hummingbird is focused more on ranking information based on a more intelligent understanding of search requests, unlike its predecessor, Caffeine, which was targeted at better indexing of websites.
It is more capable of understanding concepts and the relationships between them rather than simply words, which leads to more fluid interactions. In that sense, it is an extension of Google's "Knowledge Graph" concept introduced last year aimed at making interactions more human.