I've got some Groups in my Gmail contacts (like PhotoShare). I'd like to create (ideally auto sync) a Google+ Circle to have all those contacts to make it a bit easier to share photos, etc. (I forget exactly where (maybe on the iPad) , but in some Picasa UI's for sharing, you can choose a Circle but not a contact group.
There is currently no way to accomplish this. I had never tried until I read the question, but after attempting, searching, and reading about the pain that other user's are having regarding the lack of this feature. I do admit, this would be awesome to have.
Sources complaining about lack of this feature:
The only way to do this is to manually add your contacts to a circle. This would require two tabs in order to keep your group open and the other tab to build the circle.