The Mac beta for StarCraft 2 is reportedly going to drop in April, following the appearance of a Windows beta which became available a few weeks ago. Few burrs under the saddle chafe a Mac user more than Windows gamers having more fun than them, so this will please a lot of people. Don’t get the wrong impression, however; it still carries a “when it’s ready” qualifier, so no promises are being made, but April is definitely the target. Those who want to whine might do well to remember the Win and Mac versions of the original StarCraft were a whole year apart.
StarCraft II beta developer chat 1 transcript [Blizzplanet]