That all sounds wonderful, on paper. However, VW is infamous for faking their emissions test 8 years ago. It was such baldfaced fuckery that I wouldn't trust any information they put out ahead of time and would hope that regulators triple-check it after production starts. From Wikipedia:

"...Volkswagen had intentionally programmed turbocharged direct injection (TDI) diesel engines to activate their emissions controls only during laboratory emissions testing, which caused the vehicles' NO x output to meet US standards during regulatory testing."