Wow, great news and I will certainly be going (45 minutes away for me).
Lego has a yearly event in Holland for many years now, which are a huge success. Usually in the town of Zwolle I think.
I guess the folks at playmobil finally realised this might work for them as well. I am very curious.
The Jaarbeurs convention halls are in Utrecht. IF you fly to Amsterdam Airport (Schiphol), you can get to these halls within the hour max. Very good train connections.
You can also fly to Rotterdam Airport (Zestienhoven), but this airport has no direct train connection so that will take you longer, but you probably can still manage within two hours to get to Utrecht.