My research shows that the Gudrun Maersk, launched last summer, is 367 meters LOA and 47m beam.
Don't know for sure if this yard #203 is the same class.
According to the Wikipedia site, this #203 is the Emma Maersk. Cannot trust Wikipedia, as it's a 'free-for-all' with respect to entries.
A Maersk captain who I spoke with last night on an M class ship said that he heard this newbuild is 406 meters.
Regards,
Stuart