If it still works (which I am not sure that it does), it will not work for much longer, its a timed beta, and will expire on a certain date. The date that apple said was "When Leopard is released" so if I had to bet on it, it is already expired or will expire with in the month.
The bootcamp in Leopard, is the same bootcamp, it is just no longer in beta status, so if / when you get Leopard, you will not have a problem installing windows on your system.