Not everyone will agree with these changes but I gave it a decent shot.
General
- Changing heroes transfers 50% of the previous heroes ultimate charge
Comment: We want to give players more opportunities to counter pick the enemy team. This should reward good team play and help encourage diversity within the hero pool.
Ana
- Damage of Biotic Rifle increased to 75
- Enemies affected by Biotic Grenade can now receive 20% of healing effects
Ashe
- Slightly increased damage of The Viper
- Reduced reload time to 3 seconds
Baptiste
- Reduced damage of Biotic Launcher by 15%
- Immortality Field changed to be the ultimate ability and cannot be destroyed
- Amplification Matrix reduced from 50% down to 20%
Comment: Swapping Immortality Field & Amplification Matrix will give Baptiste bursts of damage while limiting his ability to regularly shutdown enemy ultimate combinations.
Bastion
- Reduced ammo for Configuration: Sentry to 200
- Reconfigure now applies after 1.25 seconds
- Casting time of Configuration: Tank reduced to 1 second
Comment: Remaining stationary was too rewarding for Bastion. This change should encourage good repositioning.
Brigette
- Slightly reduce armor generated by Rally
- Rally now gives all nearby allies a movement speed increase
Comment: This gives Brigette more diversity to her kit, and offers teams an alternative to Lucio.
Doomfist
- Reduced duration of shields
Hanzo
- Storm Arrows: Hanzo fires a volley of arrows into the air which rain down on enemies
Comment: This adds more area denial options into the game, and gives more meaning to landing shots with Hanzo.
McCree
- Slightly reduced move speed penalty while using Deadeye
Mei
- Increase damage falloff of Endothermic Blaster alternative fire
- Ice Wall health reduced to 300 per pillar
Comment: Mei was too good at all ranges reducing the need to pick heroes like Ashe and Soldier: 76.
Mercy
- Caduceus Blaster damage increased to 25
- Increase speed at which you can quickswitch between Caduceus Blaster and Caduceus Staff
Moira
- Increase cooldown of Fade to 8 seconds
- Reduced the rate Moira generates ult charge
Orisa
- Increase slow effect and reduce pull effect on Halt
Pharah
- Rocket Launcher projectile speed increased to 40 meters per second
- Slightly reduced knockback from Concussive Blast
- Reduced cooldown of Concussive Blast to 8 seconds
Comment: We want to make it slightly easier to land rockets.
Reaper
- Reduced lifesteal to 20%
Roadhog
- Reduced healing of Take a Breather to 250 health
Sigma
- Reduced temporary shields generated by Kinetic Grasp
Soldier: 76
- Reduced cooldown of Helix Rockets to 7 seconds
- Recovery period after sprinting reduced to 0.25 seconds
- Heavy Pulse Rifle reload time reduced to 1.5 seconds
Sombra
- Slightly increased damage of Machine Pistol
- Enemy controlled health packs can now be hacked
- Hack duration reduced to 4 seconds
Torbjörn
- Deploy Turret casting time reduced to 2 seconds
Tracer
- Increase damage falloff of Pulse Pistols
Winston
- Slightly increased landing damage of Jump Pack
Wrecking Ball
- Reduce shields generated by Adaptive Shield
- Damaging Wrecking Balls shields now generates some ult charge
Zenyatta
- Transcendence move speed reduced to 10 meters per second
- Improved the visual cues for Zenyattas orbs