The replacement car mount for my TomTom GO 910 arrived the other day.
The change appears minor. The new mount is shown on the left, and has an extra lip protruding behind the connector. The old mount on the right doesn’t have this (more shots of the mount on Flickr).
The 910 snaps satisfyingly into place in the new mount, and seems slightly harder to remove. I haven’t taken it out in the car yet, but hopefully this suggests that it will not drop the connection like the old one did.
Again, kudos to TomTom for going ahead and replacing these for free.