http://www.swtor.com/blog/what%E2%80%99s-next-old-republic
this update contains everything we all know about future plans for the game.
including space combat.
Yes, you will have to choose a type of subscription to activate your 30 days free. however, if you are not satisfied with the game after 30 days, you always can cancel your subscription. you will only be fee'd after those 30days