Everyone at this point has seen the OWCavalry posts, but they did miss a few things so I figured I'd catalog them.
1. Perks
They discussed perks and said they plan to tune them separately for 5v5 and 6v6 in cases where a perk is too strong in one format, but not the other. They've already stated they intend to nerf Ball's Steamroller minor perk cause of this; the one that makes roll deal extra dmg to Tanks
2. DPS Passive
They did mention lower dmg and HP pools in the post, but they also missed them mentioning the universal antiheal passive. The devs have stated they intend to reduce it in the 6v6 patch.
3. Tank Cooldowns
OW Cavalry touched on this, but didn't specify Tanks. The devs intend to lower some Tank cooldowns, but lower their strength to compensate. They've already stated Donina and her barrier is one such ability they intend to do that to.
4. 6v6 Stats
They plan to finally show 6v6 win rates, ban rates and pick rates next season
5. Roadhog
They brought up how most heroes winrates are surprisingly similar between formats with some pointed out exceptions being Domina who's weaker, and Roadhog and Dmon who are stronger in 6v6. The devs have stated they intend to nerf Roadhog in the 6v6 patch.
6. Scope Of The Patch
Cavalry mentioned a patch was planned for the start of season 6, but not the scope of the patch. According to the interview we should be expecting smthn big, and nearly every character will get some form of adjustments in 6v6. Whether that be the promised lowered cooldowns/ability strength, lowered HP pools, perk buffs/nerfs or dmg decreases is unknown on a character by character basis outside of the aforementioned examples they gave of Domina, Wrecking Ball and Roadhog. Worth noting tho we don't know yet how they plan to nerf Roadhog tho.
7. Potential Queuing Options
This was more or less them brainstorming with Flats and them, but they did consider the idea of queuing options where if queue times go on long enough it gives u the option of filling in for a different role/format with a match available. Like if you queue DPS and the queues go on for ten mins it may give u the option of showing an available Tank game u can fill in for.
8. Why Not Just Role Queue?
Given they removed 5v5 for the 1-3-2 test people are wondering why they're allowing both role queue and open queue for the 6v6 mini season in season 6. The devs answered this saying they're looking to test the popularity of role queue 6v6 compared to open queue 6v6 by seeing if people play 6v6 for the open queue aspect of filling roles, or if they play it cause of the 6v6 format and would prefer role queue to get the specific role they wanna play.
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Anyways that was all, and some of these were more or less clarifications rather than new info itself so that people would know what specifically was getting changed, and why, as well as examples of things the devs said will change in the 6v6 patch.