Overwatch Update brings signficant changes to several heroes
https://twitter.com/CLGMiso/status/885293335786672129
Doomfist

Rocket Punch
Total distance travelled reduced by about 20% (This change has been on the PTR for a little while now) Seismic Slam
Added a new UI indicator to show how much damage it will deal, and how much it dealt. Previously this was only indicated by the default crosshair filling in, but this is only visible when using the default crosshair. The new indicator should always be visible, regardless of any crosshair changes. Also, targeting this ability while in the air is now restricted to locations lower than your current height. McCree
Flashbang
Now slows targets significantly when they are stunned. This makes them less likely to slide away around a corner or something similar once they are stunned. Doomfist
Rocket Punch
Total distance travelled reduced by about 20% (This change has been on the PTR for a little while now) Seismic Slam
Added a new UI indicator to show how much damage it will deal, and how much it dealt. Previously this was only indicated by the default crosshair filling in, but this is only visible when using the default crosshair. The new indicator should always be visible, regardless of any crosshair changes. Also, targeting this ability while in the air is now restricted to locations lower than your current height. McCree
Flashbang
Now slows targets significantly when they are stunned. This makes them less likely to slide away around a corner or something similar once they are stunned. These are some really significant changes to some of these heroes. It is a huge buff to Zarya as he can be useful against Tracer and mercy now. Previously Mercy could just shift away and tracer could recall away from the graviton. It will be extremely important as players can now not have a ground breaking ultimate wasted.