This was confirmed on the Weeklymtg stream.
https://www.twitch.tv/videos/2265055461?t=00h35m03s
Gavin: "One thing that Brawl does on Arena is, it kind of buckets your deck into 4 different categories. We worked on (edh) brackets before I learned this btw... It seems to be working decently well for them. It pairs you against people that have a similar benchmark of cards. I think there is a lot we can learn from that."
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