http://www.octolabs.com/blogs/octoblog/2015/03/31/analysis-o...
tl;dr : Current paying customers will see a discount of up to 30%. Current freeloaders will have to pay $84/year for functionality equivalent to what they get now.
Anyone who is technical enough to use Heroku effectively can charge AT LEAST $84/hour for their time, meaning that they'd need to move to a new solution in less than an hour to save money. All the hand wringing is very silly.