Gamespot bring us some news from the Citi Technology conference, where Activision Blizzard COO Thomas Tippl has said that Blizzard will be producing six “proven property” games/expansions over the next three years.

The announcement reveals plans for two more World of Warcraft expansions over the three years. Could one of these be the Mists of Pandaren expansion we’ve previously heard rumours of? In addition, the first expansion to Diablo 3 will be expected by the end of 2014. The two planned Starcaft 2 expansions, Heart of the Swarm and Legacy of the Void, are expected in the same period.

By choosing to refer only to ‘proven properties’ Blizzard have left the door open for a new ‘unproven property’ to be released in that same period, such as the long rumoured Project Titan.

As of this writing, Blizzard has not stated anything in regards to the post-Cataclysm expansion packs save for wanting to get them out once a year at the very least. As for the next two StarCraft 2 installments, Battle.net project director Greg Canessa already indicated that Heart of the Swarm will be available in mid-2012. With that in mind, the StarCraft 2 team may close the three-part series by the end of 2014.

So far there’s no set release date for Diablo 3 although the team is shooting for a Q4 2011 release. In fact, they’re currently getting ready to launch the public beta in the next several weeks. However, Tippl added that the upcoming action-RPG has not been factored into the company’s earnings report expectations for the calendar year, leaving room for a possible delay. Still, an expansion pack is expected to hit retail shelves before the end of 2014.

As for Diablo 3 on console, that version wasn’t mentioned and may not even be considered as “proven property” given that the Diablo IP hasn’t been seen on a console since the original hack-n-slash title landed on Sony’s PlayStation console back in 1998. Blizzard’s mysterious “Titan” project is also not considered “proven property” given that it’s reportedly a new casual MMO separate from the company’s existing properties. That said, the company’s list of six seemingly consists of PC-based IPs that are currently active and long-standing.

Naturally Blizzard issued a comment debunking any talk about future projects and their release dates. “We haven’t made any announcements in regard to plans beyond our current slate,” a representative said in an emailed statement. “Currently, we are focused on the next content update for Cataclysm, the upcoming release of Diablo 3, and continued development on Starcraft 2: Heart of the Swarm.”