MW went back to their old ways a bit with soothing mist becoming a cast channel again and making other heals while channeling instant. The difference from old MW and the BFA ones is: chi doesn't exists so u can spam heals alot more often, increased dps, u lost speed buff at low lvl but gained more healing spells. Haven't tried any instanced pvp since no1 plays beta and I can't copy on ptr but if they are as strong as in beta duels they will be top tier for sure. The only thing I can imagine messing something up is a too high manacost on the spells in instanced pvp, no problems in the open world.
Back to maining MW for me again, that's for sure!