Tell your towers to hold off on incoming mail (that’s wit for ya), as beta invitations to DotA 2 are coming soon. Should fortune favor you, you’ll receive a link taking you – through Steam – to a survey asking about your gaming rig and prior DotA experience.
If fortune doesn’t, rub elbows with someone who got in; each invitation comes with an extra two to dole out as the recipient sees fit.
Opinions on whether the involvement of Valve will make for a bigger and better game should start trickling out as the gaming community gets its paws on the thing. And with that, good luck to you!