***update***
Blizzard has announced that whether each game will be full-priced products has yet to even be discussed, and from what i just found out, and am most unhappy about, is that you’ll need to purchase and install the the other campaigns in order to unlock newer units—even in multiplayer. so i guess it IS going to be a gun to the head saying you’ll need to buy all three.
however, from the looks of it, and gathering from what interviews with Blizzard spokesmen have said, each game will be an expansion on the previous spaced by at least a year. it’s completely possible that you could be paying $20 for a full-blown expansion.
the way i see it—now that this newer news has been released—is that the developers simply developed too much, and jumped the gun announcing one game and its expansions as one unit.
“Terrans: Wings of Liberty” will be the first of SC-II to be released. you’ll have access to the same units everyone else online will, but a year or so later, “Zerg: Heart of the Swarm” will have newer additions that will require you to purchase that game, and then “Protoss: Legacy of the Void” will come a year or so after that.
