From translation on reddit:
Source: http://tw.battle.net/forums/zh/overwatch/topic/3446144877
Translated
McCree
Alternate fire: Damage decrease from 70 to 45
Time before reloading decrease from 0.75 seconds to 0.3 seconds (Probably reverse patch form this)
Widowmaker
Alternate fire (Snipe) Base damage decrease from 15 to 12 (damage multiplier from charging doesn’t change)
Headshot damage multiplier increase from x2 to x2.5
Player can only re-enter “sniping mode” after the “exit snipe mode” animation finish
Infra-Sight (Ult): Ultimate charge cost increased by 10%
Bug fixes
Improve custom game “High bandwidth Mode” stability
Mercy will no longer charge her ult if her right click target is shooting shield or ice wall
Reaper will no longer teleport to weird places
Fix some bugs in Dorado (Should include the Symmetra one)
That’s a massive change to widow and the changes to McCree will really help the likes of Zarya, Roadhog, and Reinhardt, plus the feeling on reddit is this is a great change for Zenyatta who’ll see a lot more use now as the anti-tank character. The widow change will hopefully really help Pharah as well.