The Big Lizard send word that they've opened Heart Of The Swarm's beta to people who pre-ordered before December 18th. People who pre-order from now on will be placed in a kind of vat and liquidised. No wait, I read that wrong, they will be added to the beta in subsequent waves. That's right. There's a download link for the client through the link, but unless you've got beta access it won't work, no way, no how. Unless you're a magician. Or a magic hacker. Or a time-traveller. Any of those is fine.
The game itself is all set for a March 2013 launch. I've posted a trailer below, in case you've forgotten what a Starcraft 2 is, for some reason.