I'm seeing this news piece floating about the web today about HTML5 diverging into two separate standards. The story was on Slashdot a few days ago and my comment was modded +5, so I figure it's worth reposting here for others to see:
This is the similar to any source tree having a "development branch" and a "stable branch". WHATWG will be responsible for evolving the fast-paced devlopment branch of HTML while W3C will take occasional snapshots and stabilize the features of the development branch into "full standards". I assume that most of the complaints here are related to either bad marketing - WHATWG should just start calling their version HTML6 or "future HTML" or something - or the fact that these bodies (especially the W3C) move slowly and we are in the middle of a new stable branch getting pulled.
By the way, HTML5 isn't, according to the W3C a standard yet. The current HTML standard is 4.0.1. HTML5 is planned to be a "full standard" in 2014. In that time, WHATWG will introduce dozens of new major features into what will probably be called either HTML6 or HTML5.1 when the W3C gets around to pulling another snapshot.