If it was coming, it would be at roughly 3 or 4 years by typical historical timings.
I think though the mk8 this time will go a bit longer (there won't be a mk9) so maybe a few years to go.
Basically if you order now you'll get the face lift
With the launch of the mk8 in 2019, IMHO mid life facelift will probably appear towards the end of next year / beginning of 2024.
Interiors are rarely updated for a facelift, and if they did the changes would be pretty minor.
I would expect the front end styling to be tweaked, maybe change the wheels and a few options becoming standard with some new ones made available. I wouldn't hope for much more than that.
Agree. External changes are usually limited to bumpers, light clusters and alloys. VW won’t be looking to incur significant costs with a facelift; the main objective of the facelift is to maintain customer interest and sales at minimum cost. There may be some cost cutting changes too, to help offset the cost of any enhancements.
New infotainment screens and instrument displays are likely to be the extent of any interior refresh. Some models of the mk7 Golf gained the AID (digital instrumentation display) and the larger glass infotainment screen when it got its mid life face lift to the mk7.5. I wouldn’t be surprised to see the slider panel below the infotainment screen in the mk8 become backlit. All very speculative though - and I dare say much of the content of article at the link posted by @jon87 is speculative too.
@jon87 IMHO life’s too short to worry about ifs, buts and maybes. I’ve never let the prospect of a forthcoming facelift at some point in the future delay my order / purchase decision, and I’d say if you’ve decided to order a mk8 GTI, go for it now.