Warcraft IV possible - Blizzard
But no plans afoot, yet
StarCraft II, Diablo III and the small matter of World of Warcraft's ongoing expansion - yet still Blizzard aren't done. Speaking with UK blog VG247 at Games Convention, co-founder Frank Pearce said that Warcraft IV is definitely a possibility for the future.
The exec qualifies this stating that a Blizzard development team would need to want to create the project: "If there’s a team that’s passionate about doing another Warcraft RTS, then that’s definitely something we would consider."
There's nothing in the works right now, however.
"We have development teams working on Wrath of the Lich King, StarCraft II, Diablo III, and when those teams are all off the projects they’re working on, they’ll be intimately involved in the the discussions about what’s next," Pearce concluded.