I noticed couple of things which were not mentioned yet.
For the negative changes list:
All group 2 partners won't have Medallion Mileage Bonus anymore.
Both for positive and negative
Hawaiian will start earning MQM and MQD (though it's probably not a big thing as it's still for the flights inside Hawaii only).
BUT the number of RDM will be lower for discounted and deeply discounted economy fares (25-50% instead of 50-75%).