Ahhh – 26th June it is then.
It seems as though someone has uploaded a number of European release dates on the Nintendo Europe servers. There’s release dates for Splatoon and also Yoshi’s Woolley World among others. Splatoon is listed as arriving in Europe on May 29th, which could be the same for North America. The wonderful Yoshi’s Woolley World is listed on the site and is coming to Europe on June 26th.