The first of three StarCraft mission packs will be releasing at the end of this month, Blizzard has announced.
Nova Covert Ops will kick off on March 29. The first pack will feature November "Nova" Terra, as she takes on top-secret operations for the Dominion. Pre-purchasing the full bundle will net you a Covert Ops skin for your Ghosts in Starcraft 2. The bundle is available on Battle.net for $14.99.
This will be the first of three packs that includes new mechanics, with the second and third entries slated for later this year. Since it's standalone, you don't need to own StarCraft or StarCraft 2 to play it.