Dear Developer:
MTA New York City Transit has released a new Planned Service Changes feed, available from http://web.mta.info/developers/developer-data-terms.html, which provides information on planned subway and bus service changes (the same information which feeds The Weekender and http://travel.mtanyct.info/serviceadvisory/) in an XML file with machine-readable metadata to identify affected services, directions of travel, and times. The feed contains all planned subway and bus service changes for a rolling three-week period.
We will have more detailed documentation on this feed available in the future.
Kurt Raschke
NYCT | Subways | Technology, Preparedness, and Communications