according to sea & I the two yacht have the same owner and are not for sale, they will also keep Newcruise and interior designer for 778
I think its build for an american business man in the construction business.
Nobiskrug also have the 780 project for 2008 http://www.agent4stars.com/yachts6.htm
just realised this should, possible have been under nobiskrug link.But cant delete.....
I was a shame 777 did not show up at Monaco Yacht show