So the work is going slowly but their plan is to get the law or suggestion passed in order to start enforcing this the 1 Dec, the law in current format will make it so that large gatherings or events (100 people or more) indoors will require a vaccination pass or the event will require to implement other restrictions (at the moment the official one considered is max capacity of the event determined by the size of the local, or enforced distance between people)
The official narrative is that due to other countries rising cases in Europe, thus Sweden need to get on the train in advance to help reduce the strain on the public system...
It'll no doubt be the same system the rest of Europe is using as well.