It’s during an interview with IGN, that Producer Tim Morten told that the return of the Warcraft franchise to the RTS model isn’t impossible once the development of Starcraft II : Legacy of the Void is done.
“It’s very rewarding for us to hear that there’s demand out there for more RTS content in the Warcraft universe so once we’re done with Void I think we’ll get together as a team and talk about what would inspire us to work on next. There’s no question, though, that we’ll consider Warcraft, StarCraft, or even new ideas. Anything is possible.”
For now, the development of a Warcraft IV could be problematic for being coherent with World of Warcraft, maybe we could play character such as Anduin and others but in the distant future, far from the current timeline of WoW.