I hope that there is a rework plan in progresss for all the weakest characters, as well as you have plans to beat mechanics like dodge roll. However, we know that some plans did not turn out as planned: shugoki and hitokiri are irritating to fight against but most of their kit is rollable, raider received a gross overbuff, pk and wl buffs were very far from enough, black prior combo bashes can't be punished. I think if you had shared your pk plans on the worktable, we could have saved some work, monitoring and frustration: everyone could have seen it won't be enough. Sharing plans one week prior release is far too late.
If you would share the exact directions you are planning, I think people would spot the obvious flaws, like the fact shugoki mixup is safely rollable all the time.
While the idea is good, I do have to mention the fact that the community is doing the balancing teams job every day. Many people are rather proficient at the game and give a lot of valuable suggestions every day. But since even the top 4% seem to be regularely ignored, they would need to step up their communication to acceptable levels and they won't do that.
Them sharing their specific ideas or plans would be wonderful but i'd require direct and honest communication. Such methods are standard for a lot of other titles, yet the FH Devs fail miserably in that aspect; something I still don't quite get.
I think it is a good idea for them to be more transparant, but I wouldn't share "halfplanned reworks" with the entire community. You'll get thousands of threads saying how it could've done better. I probably would share it only with a group of very knowledgeable players and have them sign some sort of NDA. They could then say what they think of it and suggest changes accordingly.
EA does something similar with their game changers program. But since the Sims isn't a fighting game that needs balancing, a lot of game changers are content creators.