This month, in the beginning, some changes appeared in the way the search engines process the data indexed by their crawlers: Schema.org was officially introduced to the public. Three major search engines united to help improve the search results and to make search listings richer through structured data.
As Google announced here, on their official blog, on the introduction of Schema.org:
Today we’re announcing schema.org, a new initiative from Google, Bing and Yahoo! to create and support a common vocabulary for structured data markup on web pages. With schema.org, site owners and developers can learn about structured data and improve how their sites appear in major search engines. The site aims to be a one stop resource for webmasters looking to add markup to their pages.

But this is not enough: the crawlers can read the text, but it's not easy to understand their meaning. Every developer write the code in his/her own way and they will always structure the form and the content of the script as they consider fit. They developers may also use various types of CMS like joomla or wordpress (actually there are dozen or hundreds of CMS in the world as everyone can make his/her own) to make their job easier and deliver the project faster, in this case all the sites they design will take in consideration several types of structured data.
Retrieving the data from one site is easy, recovering the original structured data (as the designers and developers thought to show) is more difficult. With Schema.org the three giants Google, Yahoo and Microsoft (Bing) tries to bring all these structured data to a specific formatted structured data that is very easy to understand by the spiders. In this manner many applications (especially the search engines) can benefit from the direct access to the structured data of the sites.
It's not quite a revolution, but this steps is an important one in the relation between SEO and web designing. It have been obvious from some time that there can work perfectly only together, as a team, and this move from the giants of web searching only bring together this 2 aspects of creating and maintaining web sites.