When were the 2017s originally available? When did VW first allow you to look at and build 2017s?
That will give some idea. If 2018s are just now hitting the lots, and aren't even on VW's web site, did that mean the 2017s came out in Sept. 2016 and lasted for 16-18 months on the market?
If so, does that mean the 2019s won't hit until June 2019?
Or will 2018 be a "short" model year?
Or maybe they'll just pull a Corvette and just skip MY2019 on the Golf/GTI/R. Maybe MY2018 will be the end of the Mk7, and they'll just wait until MY2020 to bring out the Mk8?
Or maybe this new People's Warranty will have MY2018s flying off the lot, and they'll be ready for 2019s in September.
All conjecture. But look at how the 2017s rolled out. That will give some inkling of how 2018s will roll, and where 2019s might stand.