Fitting into the hacker motif, I want to see Sombra have a sort of Mute like ability.
Like, her first ability is to silence the first ability of her target for 5 or 6 seconds.
what would be great, is if this acted as an interupt as well. Things like pulling reaper out of his wraith form, halting Rein's charge, turning off 76's sprint, no more blinks for Tracer, Pharah just falls to her death.
This could make for some really fun moments. Like silencing a DVa that just charged over the Well on Ilios, to see her fall to death.
This would give her a natural counter/countered system with several characters. Letting her counter characters with good escape abilites, but not being able to counter characters with good damage abilities.