I have just obtained it from Aloha Tropicals. Their description says:
"Cross pollinated to get large flowers this ginger has very large clusters of 4" flowers on a 1' spike, its flowers are creamy yellow with a darker yellow throat. A very tall sturdy thick stalk with large broad leaves. Height to 9'. One of the largest Hedychiums. Nice landscape specimen!"
Their photograph shows a rounded head of large cool lemon flowers.