I think it’s highly likely Genji and Mauga are gonna get nerfed at the start of the next season.
Knowing Blizzard’s track record Orisa will get buffed again after just receiving nerfs.
Possibly might see a utility dps hero like mei or Symmetra getting a small buff(but that’s more so just wishful thinking).
Small Widow nerf or buff to one her counters.
Mauga I can see, even though he’s fine right now and has a terrible pick rate maybe it’s enough to where people get angery enough to nerf him into the floor, sure
What has genji done though
Genji and Tracer are benefiting a lot right now especially at higher levels of play where they get a lot of value from Juno, he’s also one of the few DPS heroes who are a good counter for Widow who’s also strong right now.
Genji is one of those heroes who doesn’t go long without receiving nerfs once his pickrate rises.
Nerfs: Ana, Juno, Widow
Buffs: Mercy, Soldier, Sombra
My prediction is that people will whine about the patch on the same minute the notes have been announced, way before they are able to play it.
I predict lots of people will be unhappy and vent about it on the forums
I predict
CHANGES 
Just nerf Widow, Juno and Junkrat please!
Widow alone ruined this season for me.
Junkrat? LMAO
You forgot the Tracer buff!
My prediction:
Juno baby nerf
Random ahh Bap buff
And Sombra “rebalance” (it’s a nerf)
Buffs: Hazard, Hog, Zarya
Symmetra, Tracer, Tracer, Tracer, Hanzo,
Mercy, Lifeweaver
Reworks: The Reaper rework that has been teased since like season 9???
Nerfs: JQ, Orisa, Mauga
CASSIDY(x4), Widowmaker Sombra because why not
Baptiste, Juno, Ana
(Please note that these may not be the balance changes that I want and are merely predictions)
They’ll probably give +1 sec on grapple. All our problems are solved! 
something something marvel rivals
“ShE’s A tOp pIck In EvERy rAnK oN oVErbuFf.”
But nobody’s gonna point that out because Overbuff only matters when it’s a character they don’t like.
Overbuff doesn’t matter for anything anymore. Until Blizzard opens up their data and fixes the apis they do have, scraping profile data just isn’t going to work, at least not the way Overbuff does it.
hopefulyl rammatra would get some nerfs as well ive never like rammatra as he is op as hell if your able to master him
Ramattra? Hell no, where’d you get that idea?
his damage is freaking high compared to other tanks and honestly i think his ult should get nerfed its oftne being used to spawn trap people
Not many people are having problems beating Ramattra. He isn’t anywhere near op or meta.