So a sniper that can shoot biotic canisters for healing and bullets for damage? Then again, we don't really need another sniper character that is a damage machine, and being a two in one like that would make Widowmaker obsolete. So maybe the rifle only shoots healing canisters and there will be a secondary short range offensive weapon? At least the rifle being purely for healing is supported by the picture.
A ranged healer would be pretty solid though. Currently support has to be in the thick of it to be effective, and although some Mercys and Lucios are stupidly good at staying out of the way of enemy fire, having a dedicated long range healer would be pretty nice.