Rabid LEGO Mindstorms fans finally have a date to circle on their calendars for hitting the company's website and breaking out their credit cards -- April 1st has been announced as the start of pre-orders for the highly-anticipated new NXT robotics set. NXT bots use non-traditional stud-less LEGOs, Bluetooth-enabled 32-bit controllers, and three precision servo motors for a much more powerful and flexible tool set than previous offerings. Despite their steep price compared to regular packages, buyers are limited to five of the $250 sets during the initial pre-order.