Grid Fill Manager provides an interface to control the behavior of the new Grid Fill function in Blender 2.68.
Paul Kotelevets writes:
Written by Alexander Nedovizin and Paul Kotelevets started new addon, called Grid Fill Manager, that dynamically proceeds selected loop with active vertex via new Grid Fill function from Blender 2.68 release.
Video, showing addon in action.
Download link could be found in video description.
No official BA tread currently, sorry. Some posts are currently placed here.