With the launch of the revision access rules, data providers can create products that give subscribers access to a subset of data set revisions based on their subscription start date. Starting today, subscribers are able to choose products that include only historical revisions published before their subscription start date, only future revisions published after their subscription start date, or future revisions with a certain number of past revisions from their subscription start date. Before revision access rules were available, subscribers would receive all of the available revisions of a data set, including those published before and after their subscription start date. With the launch of this feature, subscribers pay for and access the revisions that they actually need, while providers have the flexibility to price historical and future data appropriately without having to create and maintain multiple data sets.
Source:: Amazon AWS