Overall it seemed extremely clear they want people doing nightmare as soon as it's available, and helltide/legions otherwise. They very clearly didn't like the old dungeon leveling metal, and they apprebtly thought people were leveling too quickly and easily.
On the topic of wispers, I don't understand why they removes sigil dust and then buffed the exp bonus. You'd think they'd want to give sigil dust so people could grind wispers during overworked stuff and then go do nightmare content, so this overall just seems like another push to just to NM dungeons.
As far as class stuff, I leveled as a minion necro and switched to bone spear. I enjoy the minion buffs, as I struggled with going into WT3, and the bone spear centric nerfs don't seem buld breaking.
Overall, their vision seems clear: level in nightmare dungeons at your appropriate difficulty level, but not too quickly or easily. Weird response imo.