You may have heard of a rather well-made little game called World of Starcraft that was making the Starcraft II custom game rounds recently. It's still a work in progress, but what's there was looking really promising. I'd love to link you to some of the footage of the game but unfortunately and unexpectedly, Activision had all the media relating to the game pulled from YouTube due to copyright infringement. So far this is the only place Activision has shoved its nose, but they've been strangely quiet on the matter of whether or not they'll keep up this little fight.
The game's creator, known only as "Ryan", claims that he was never directly contacted prior to the event. He has since been in contact with a Blizzard official, but has decided not to comment on the matter publicly until "the dust has settled".
At the same time, however, Riot Games design director Tom Cadwell has contacted Ryan for possible future employment, as is their policy whenever they see promising, hard-working modders. Looks like this is one of those "blessing in disguise" situations for our friend Ryan.
As for the StarCraft II mod, Cadwell commented that he's not too worried about it. His guess? Blizzard probably just doesn't like the name.
"I don't know because I'm not a Blizzard employee, but I seriously doubt this is anything other than the fact he named the mod World of StarCraft, which has an air of legitimacy that borderline infringes on Blizzard. Blizzard is very supportive of their modders, but also vigorously depends certain aspects of their IP (as they should and must)."