The W3C and the WHATWG have parted ways due to various political and procedural disagreements.

The WHATWG represents the Browser Vendors more directly and is committed to an ongoing ever-evolving HTML standard rather than fixed release numbers. They also tend towards the more pragmatic side of things. They are probably the ones to watch.

(This is based on my limited understanding. I'm happy to be corrected here)

>The WHATWG represents the Browser Vendors more directly and is committed to an ongoing ever-evolving HTML standard rather than fixed release numbers. //

So you're saying there are two groups claiming to have the canonical HTML spec now?

Exactly. However the W3C have rather lost their claim to legitimacy after the XHTML2 debacle.

any sources or articles about it?

Other than Googling it for you, no. I vaguely followed the controversy at the time and so I don't have any specific source.

Not the first time, I would imagine...

see also: http://xkcd.com/927/

This is such a silly comic. There might be one more standard but its a step in the right direction and multiple vendors adopt the 15th standard sooner or later.

multipe vendors have multiple interests , especially those who ship standards on proprietary plateforms.