Lately there is a lot of talk about HTML 5 and when is going to be ready, we added a few useful links that might help you understand more.
What is HTML 5 by Wikipedia:
HTML5 is currently under development as the next major revision of the HTML standard. Like its immediate predecessors, HTML 4.01 and XHTML 1.1, HTML5 is a standard for structuring and presenting content on the World Wide Web. The new standard incorporates features like video playback and drag-and-drop that have been previously dependent on third-party browser plug-ins such as Adobe Flash, Microsoft Silverlight, and Google Gears.
A great infographic on what is HTML 5
HTML Wont be ready till 2022?!
HTML 5 Web development to the next level