I call BS, this is just Germany looking for a way to take the heat off VW and there mess, and the other issue is, the emissions requirement in most places other than China , is hard to make work and also get good MPG and a reliable quiet engine.
By the way, I have a friend with an early 2015 Golf Diesel and no matter how he drives it, it gets 50+MPG and on some trips to Cali, he has gotten over 65MPG. Gutless Engine though, I would never want it.
He doesn't want them touching it, because he thinks if they fix the emissions issue, his mpg will drop like a rock. I think he is correct.