I wouldn't be surprised if there is one. They started mass production of the wii AGES ago, and i havnt heard of any problems. So, i wouldn't be surprised if all the launch consoles for Japan, america AND europe are being boxed or having the finished checks and a lick of paint.... If not, then they can't be far behind....So even if it's not quite a 'world' launch, i think there will be a maximum of a month between Japan and Europe launches.
P.S Anyone from nintendo can say what they like. People change their minds, people lie so that they can shock you all later. Who knows?