From a wonderful BroadwayWorld.com article:
The National Theatre of Great Britain's production of WAR HORSE, presented by Lincoln Center Theater and the National Theatre of Great Britain in association with Bob Boyett, is now in previews at the Vivian Beaumont Theater (150 West 65th Street). WAR HORSE is based on the novel by Michael Morpurgo, adapted by Nick Stafford, with Handspring Puppet Company, and directed by Marianne Elliott and Tom Morris. Opening night is Thursday, April 14 at 7:00 pm. In the following video, Handspring WAR HORSE creators discuss the construction of their famous horse puppet on stage at this year's TED conference.