The BioWare developers have been quite vocal lately on the SWTOR forums, and have been hinting repetitively at there being more healers than just the Sage, Sorcerer, Scoundrel, and the Operative. Apparently three out of the four classes on both sides, will have an advanced class option that's a full dedicated healer. Which means only one of the classes won't have a healing AC option for both sides. It's very fresh and interesting to see so much diversity within each class. At least players won't be forced to play a certain class to do a specific role. Options are the key!