I can easily see warcraft making a return as another type of game, returning as a RTS is certainly not impossible but considering blizzard's focus on starcraft 2 i think it would be a long way off.
Right now warcraft is tied up as an MMO so unless wow fails hard and they pull the plug i don't see anything changing anytime soon, to be honest a wow2 would be more likly at this point than a warcraft 4.
Speaking of warcraft though i do recall reading some time back that blizzard was looking into way's of making warcraft 1 and 2+expansion compatible with more modern operating systems possibly as a HD remake or a starcraft 2 engine port, this is blizzard were talking about though so don't expect any official annoucments for atleast a decade.
(sorry i don't have a source for that information but if i recall it was talking about during blizzcon 2013 so shouldnt be too hard to find)
Right now warcraft is tied up as an MMO so unless wow fails hard and they pull the plug i don't see anything changing anytime soon, to be honest a wow2 would be more likly at this point than a warcraft 4.
Speaking of warcraft though i do recall reading some time back that blizzard was looking into way's of making warcraft 1 and 2+expansion compatible with more modern operating systems possibly as a HD remake or a starcraft 2 engine port, this is blizzard were talking about though so don't expect any official annoucments for atleast a decade.
(sorry i don't have a source for that information but if i recall it was talking about during blizzcon 2013 so shouldnt be too hard to find)