This is marketing.... it is vital if smaller(or less popular) game to avoid big titles release date..

Blizzard need to satisfy a lot of hardcore fans out there... and they're popular at releasing great games... you don't see them chincai chincai make 1 game and release right..

It's the same for Starcraft Ghost... we've seen the trailer, screenshots, wallpapers and what not.. but they rather drop the project off coz they dun think its gonna work..

You should see Blizzard as a Quality over Quantity type of company... Just see how many rubbish games that EA has released... chincai chincai release..