I don't want to be the one to rain on your parade, but honestly, how trustworthy is that site? Think about it this way. RPGs revolve quite a bit around improving weapons, crafts, skills, and getting new types of magic spells. The only characters that can be said to have any kind of magic in starcraft are a few protoss units (high templar/ Dark Archons) and maybe ghosts. Bearing that in mind, do you really think that a World of Starcraft would even be feasible using StarCraft characters (without radically altering the StarCraft style and story, that is). I just don't think that game is real because Sci-fi doesn't mix well with RPGs. I know that there are a few successful sci-fi RPGs out there, but honestly if you compare their style of play/Universe/Mechanics to that of StarCraft, you'll see that StarCraft wouldn't work well that way.
Also, the sketchy nature of that websites post on the supposed "World of Starcraft" leads me to doubt its credability. After all, it only has 2 screenshots and one sentence about something that should be VERY BIG news in the game world. On top of that, a search for anything related to "World of Starcraft" at blizzard's site reveals nothing, not even a cryptic sentence about something new on the horizon in the Starcraft World.
My final argument against this supposed new game is the fact that those screenshots look so very much like the multiplayer mode for StarCraft: Ghost. Before blizzard announced its cancelation, they had spoken of the fact that you could play as terran and zerg (not sure about protoss) and the screenshots of in game action looked very much like those screenshots (the units anyways). If you look at the background of those screenshots, (if you've played the starcraft campaigns) you'll notice that the background is just pictures from StarCraft that appear before you see your mission briefings (load up StarCraft if you don't believe me).
I've been a big fan of StarCraft for eight years now, and as a result I feel that I cannot allow any unrealistic rumours start that will get people's hopes up for no reason. This new game may very well be a hoax, but I assure you that Project Revolution is most certainly real, and with the "indefinate postponement" of StarCraft: Ghost, it is the closest thing to a new StarCraft game/ StarCraft 2 that we are going to get until Blizzard decides to get up off its butt and make an awesome new game for the StarCraft fans.
-Zorak