Maxwell Frazier on 5. Apr. 2017.
Regarding those icons, I'm sure someone else must have guessed it by now but it is probably clues at what the next hero is able to do.
think about the ana teaser where it showed her weapon blueprint with a rifle adaptation of mercy's caduceus staff - followed by commentary from mercy being anxious about the potential for her tech to be weaponized.
think about how orisa was described as a mix of other hero abilities - her shield could be described as a mix between mei wall (static placement), winston barrier (round shape), and rein shield (one way protection. Her primary fire could be described as a mix between bastion's sentry and dva attacks (dva's mech shots slow her down, dva's pistol shots are slow). Her right click could be described as a zarya ult, and her ult could be described as a symmetra ult plus a mercy dmg boost. Orisa could similarly be described in roughly 8 icons, so I would be willing to bet these icons show what the hero can do.
My prediction: we've gotten new supp