Recently, part of the new road for the A3 at Hindhead (south of Hazel Grove interchange) opened to traffic. There's a number of new roads, and roads being renamed. Currently I've edited openstreetmap to reflect what I saw on the ground in the past few days, and it should still permit sensible routing.

Highways Agency are hoping to have finished all the works south of Hazel Grove soon, so it'll need adjusting again soon.