ARL has released the Guide for Research Libraries: The NSF Data Sharing Policy.
Here's an excerpt:
The Association for Research Libraries has developed this guide primarily for librarians, to help them make sense of the new NSF requirement. It provides the context for, and an explanation of, the policy change and its ramifications for the grant-writing process. It investigates the role of libraries in data management planning, offering guidance in helping researchers meet the NSF requirement. In addition, the guide provides a resources page, where examples of responses from ARL libraries may be found, as well as guides for data management planning created by various NSF directorates and approaches to the topic created by international data archive and curation centers.