This is a list of all games developed and published by Blizzard Entertainment Real-Time Strategy (RTS) Warcraft: Orcs & Humans/ 1994/ Fantasy Real-time strategy game Warcraft II: Tides of Darkness/ 1995/ Fantasy real-time strategy game Warcraft II: Beyond the Dark Portal/ 1996/ Expansion pack StarCraft/ 1998/ Science fiction real-time strategy game StarCraft: Brood War/ 1998/ Expansion pack Warcraft III: Reign of Chaos/ 2002/ Fantasy real-time strategy game Warcraft III: The Frozen Throne/ 2003/ Expansion pack StarCraft II/ Under development/ Science fiction real-time strategy game Role-Playing Game (RPG) The Lord of the Rings/ 1991/ Computer role-playing game Diablo/ 1996/ Action-oriented computer role-playing game Diablo II/ 2000/ Action-oriented RPG Diablo II: Lord of Destruction/ 2001/ Expansion pack Massive Multiplayer Online Role-Playing Game (MMORPG) World of Warcraft/ 2004/ MMORPG set in the Warcraft universe World of Warcraft: The Burning Crusade/ 2007/ Expansion set for World of Warcraft World of Warcraft: Wrath of the Lich King/ Under development/ Expansion set for World of Warcraft First or Third Person Shooter (FPS, TPS) StarCraft: Ghost/ Indefinitely postponed/ Third-person shooter Other Games Battle Chess II: Chinese Chess/ 1991/ Xiangqi simulation The Lost Vikings/ 1992/ Platform game Rock N' Roll Racing/ 1993/ Racing game Blackthorne/ 1994/ Cinematic platform game The Death and Return of Superman/ 1994/ Side-scrolling beat 'em up The Lost Vikings II/ 1995/ Platform game Justice League Task Force (SNES version)/ 1995/ Fighting game
Didn't Blizzard say they were working on a third game besides Starcraft 2 and WoLK? Or I could've been hallucinating that day.
I'm not too sure; let me take a look at the Blizzcon article. This will be edited soon with an update.