http://www.pcgamer.com/new-overwatch-hero-moira-announced-at-blizzcon/

Overwatch has its angelic healer in Mercy, its grizzled healer in Ana, and now its flat-out evil(?) healer in Moira, shown off in a new trailer at BlizzCon 2017 today. "She does a tremendous amount of healing. She can also do a tremendous amount of damage as well," said Jeff Kaplan. 

Check out the video below for a look at Moira's abilities, which include a yellow healing orb that can chain to multiple friendly heroes, a bouncing purple orb that dishes out the damage, a teleport, and a combined yellow/purple beam that looks like it heals friendlies while also liquidating enemies.