The announcement Thursday comes even as a judge continues to weigh whether the masterpieces should be moved at all from their current suburban home.
Foundation officials have been embroiled in a years-long legal battle over the multibillion-dollar collection.
A judge ruled in 2004 that officials could break the will of founder Albert Barnes and move the art from Lower Merion because of crippling financial problems. The judge is re-examining the ruling after a group opposed to the move alleged in a lawsuit that he didn't have all the evidence when he made the decision.
Barnes president Derek Gillman said Thursday he is confident the new facility will open in May.