In September, the treaty will open for signature. Nuclear armed states and many of their allies have boycotted the treaty and have done all they could to try and derail the negotiation. They failed, but their absence is significant as unless a country ratifies the treaty, it is not bound by it.
Nevertheless, the importance of the treaty is enormous, it will make it harder for the proponents of nuclear weapons to describe them as a legitimate and useful means to provide security. The treaty sets the benchmark for a world where nuclear weapons are considered as a threat to security, not an avenue to it.
In this time where the threat of war has become thinkable again, world governments must use it as an impetus to come to their senses and disarm.