Right now we are in transition from both the old (existing) automation as well as to a new(er) ruleset. The hope was to have this up and going by Spring 2016 but real-life has intruded and taken the majority of time currently for both myself and our other coder.
Right now we are doing playtesting of some of the new rules while new automation is being constructed to support those, and I still intend to have NBT back up and running in the next couple/few months (my real-life issues should be fully resolved and life back to normal this month).
The link you have is to the current (previous?) NBT that has ended, and once signups are available for the next one, I will post a link and probably send all forums users an announcement then.
Until then, stand by!