I agree, Blizzard does care a great deal more about WoW, but you have to think logically, of course Blizzards going to favour WoW over the other games.
Think of it this way: you have 3 kids, all 2 of them do all day is take your money and spend it on beer, but the other one has a job and brings in a steady supply of money and stays clear from bankruptcy. Which one are you going to like? The answers obvious. You cant really blame Blizzard for favouring WoW more, theyre just human beings like us. We all like money dont we?
And anyway, maybe they're releasing more ptaches so they can have more funds for SC2 or Diablo3.