Three new GPS Interface Specification documents came out yesterday:
Navstar GPS Space Segment/Navigation User Interfaces (IS-GPS-200H, 24 Sep 2103)
Navstar GPS Space Segment/User Segment L5 Interfaces (IS-GPS-705D, 24 Sep 2013)
Navstar GPS Space Segment/User Segment L1C Interface (IS-GPS-800D, 24 Sp 2013)
You can find these new documents posted on the NAVCEN GPS References page: http://www.navcen.uscg.gov/?pageName=gpsReferenceInfo or from GPS.gov at http://www.gps.gov/technical/icwg/