Rally should have never been a permanent shield buff. It should have always fallen off after awhile. It was so advantageous to use it out of teams fight. The D'Va change might be huge.
These are changes that look pretty significant, and all of them aimed at countering GOATS.
Reaper is going to be annoying as hell now, probably going to be one of the best 1v1 in the game now.
I don't think the nerf to defense matrix is enough. It's a step but won't be enough. I think what defense matrix needs is a nerf in range it's 15 meters now, should be around to around maybe 10meters max. And they should remove some stuff it absorbs, way too many thing are negated by defense matrix.