In the AngularJS 1.2 and Beyond meetup last night they talked about Protractor and said that they are migrating all of their end to end tests to Protractor. It sounded like this is in the early stages but is the direction they are going. The slides are at: https://docs.google.com/presentation/d/1WHCcp3G3HxoE7b_ut_ERKJF4zQK_P4qFlESjE2E9AUQ/edit and I assume the video will be available in a couple of days. Here's the link to the meetup:
http://www.meetup.com/AngularJS-MTV/events/120927882/
btw, there was a ton of really interesting info in the meetup -- well worth the watch.