Delta business class saver awards between the US and Europe were 62,500 miles each way. That’s the price from the no-notice devaluation for travel June 2014 onward.
Now, for travel January 1 onward, US-Europe will be 70,000 miles each way at the saver level. There was no notice given for this change, it’s simply in effect. That’s an increase of 15,000 miles roundtrip.