This 'previewing' is a real feature of Kingston Heath, and one of my favourite aspects of the course. If it was intentional, it is brilliant. However, I have never heard or read anywhere that it was intentional, so I'm assuming it can be put down to good fortune.
The 6th, 9th, 11th, 13th, 15th, 17th pin positions are very difficult to precisely determine from your approach position in the fairway (or on the tee in the case of 15).
Every one of these greens can be previewed before you get to them though:
6th (from 1st tee), 9th (8th tee), 11th (coming off 2nd tee, when you can also check the 5th green), 13th (coming off 11th tee), 15th (14th fairway), 17th (7th green).