Blizzard has confirmed that its DoTA (also known as Defense of the Ancients) mod, which was shown off at last year's BlizzCon, is still in the works.
"We basically put it back up in the shop and did some massive overhauls to some things, which I'm not going to go into specific detail about," said lead producer Chris Sigaty. "But yeah, we are working on Blizzard Dota, and we do intend to launch it at or around the time of Heart of the Swarm, but the official details will be online later."
When asked if it will require the Heart of the Swarm expansion to play, Sigaty said "We're not even talking about the business level decision of it at this point."
Heart of the Swarm is expected to be released either this year or next, depending on Diablo 3's release.