I thought the same thing. The use of the term "heroic" in SWTOR indicates a quest that is designed for multiple players. If the new space missions are single player only then it doesn't seem to be consistent with the rest of the game. Other than that, I'm looking forward to trying out the new space missions when 1.6 rolls.
However the thing that I find most confusing is that they are called "Heroic" missions. Since there is no mention of these being 2-4 person missions, wouldn't it be better to call them Hard Mode missions? (Or something in that fashion?)