Hey Tom,
From just one of the people involved with some of the new routes, none of the existing routes on Peak Head have been effected from the new bolted and mixed lines put up to date.
A hell of a lot of care was put in to make sure that none of the bolts on the south face can even be seen from albatros and no retro bolting has taken place thus far.
The aim was to complement the already existing atmosphere and style of the area, not change it.
From a non-biased point of view, they are definitely worth a look.
Rich.