Patch notes:
#2 is the change they talked about earlier which I assumed would be S4 - when a group has disparate ranks, they’ll be put against other groups that have similarly disparate ranks. This means solo players should more often be spared from the chaos caused by these groups, although sometimes they’ll still have gaps that require solo players to fill.
#3 is probably what Keller hinted at, making Comp matchmaking more strict about MMR. I’m worried about the reduction in Unranked queue times, that was never an issue for me, I wanted more strict matching there too.