That's the biggest container ship; I believe the world's biggest ship of any kind will be 488m long ... a natural gas processing vessel which will eventually be docked off the coast of north-west Western Australia.
1. That is will be
2. This: http://en.m.wikipedia.org/wiki/Pieter_Schelte isn't quite as long, but quite a bit larger in tonnage (around 50%, IIRC) (pictures at http://www.upstreamonline.com/live/1376740/Pieter-Schelte-co...)
3. There is a small chance the container ship and the Pieter Schelte will meet in Rotterdam soon.
http://www.nytimes.com/2014/11/02/magazine/the-biggest-ship-...