Agreed. There's not going to be a refresh this early in the GTI's life, just detail changes from year to year until a major facelit in a few years when the next generation MQB changes come in, more so with the ever evolving electronics and if VW decide to have a new 'family face' front end.
As all the newly released models are sharing the current Golf face that's unlikely for a while.
LED headlamps might start to creep into the range soon, new (evolved) media systems are creeping in too and possibly an Edition 40 late next year (assuming the R400 doesn't get released instead of it rather than as well as).
I think VW introduced the R Line to the UK as a bit of a range refresh alongside the Match so major changes aren't imminent anywhere in the Golf lineup