LEGOWROLD 2009 the biggest LEGO event in the world, starts on Thursday, 22 October 2009, if you still want to visit you will have to purchase tickets on-line, or in the Intertoys (a dutch LEGO shop), you can not purchase them at the entrance!
look at http://legoworld.nl/english for more information.
During this show we will be present with a large MINDSTORMS stand, for all your questions.
Consider the sheer size of the thing when comparing it to the NXT bricks!
If you do that, I'll get you a free entrance ticket :)