Just a few observations on some comments already posted:-
Boeing Flight Crew Training Manual B747-400 states " overweight landings may be accomplished by using normal landing procedures and techniques" - an engine out landing does not incur any extra landing distance.
If an engine fire is reported to the crew, who may not be in receipt of a warning in the cockpit, then a quick return and overweight landing may be desirable, rather than delay the approach for fuel-jettisoning.
I am not aware of any ATC flight plan containing such last-minute information such as fuel on board and persons on board. Some airports do request the total pax and crew on board when requesting start clearance, but I have never been asked for fuel on board even after declaring a Mayday for engine-fire after departure. TOB and dangerous goods-yes.
Well done to the crew-quick decision-making and obviously good CRM and co-operation from JFK ATC.