Every member ninja that hasn't checked out this yet should do it NOW!!! The Fire Dojo is open, but it is still under construction. We have waited for it since June (I think), when it was only known as a new room. You can find the amulet (which is needed to open the fire door) in the Martial Artworks catalog.
Be ready for a new path... Sensei, and also, the new game Card-Jitsu Fire should be there when it's finished! It should be done next Friday, as most constructions stay a week until they are done.