I've been driving Golfs for years, Mk2, Mk3 and Mk5, not all GTIs though, and I have to admit that I find it hard to distinguish a normal Mk6 and Mk5 from a distance. They kind of just seem the same. I've yet to see a Mk6 GTI on the roads though.
VW have a winning formula with the Golf and they would be stupid to radically change it's appearance. It wouldn't be a Golf otherwise.