No, these screenshots appeared even earlier; they were posted on Facebook on March 4th, if you look at the update date.
For now, the discussion was about leaving the direct attack, which doesn't consume mana, available to all heroes without exception.
Most likely, this button only resets the newly spent skill points. If you close the skill window and open it again, it's unlikely that you'll be able to retrain the hero; otherwise, the imbalance would be terrible.
I think it's just that not all heroes have access to all schools.
Цикл "Закадычные враги": "Особенное гостеприимство, "Супероружие", "Меж молотом и наковальней"
"Падение Шантири"
Кампания для "Кодекса Войны"
"Выбор Сагиттеля"