From the Disneyland Annual Passholders Facebook page:
Sorry if this has already been posted!From July 16-18, Annual Passholders who visit Splash Mountain can receive a poster honoring the 25th anniversary of the attraction.
Valid AP is required; check your AP for blackout dates as park admission is also required. Subject to change. Available while supplies last.
Distribution will be across from the Splash Mountain exit, near Pooh Corner. Guests are not required to ride the attraction.