A few weeks ago I wrote about the relationship between auto-enroll rules and prerequisites.
Here's another enhancement in EKP 4.7: it's now possible to define an auto-enroll rule based on elapsed time since the learner's Join Date.
This should be very useful to anyone looking to deliver staged orientation training using EKP. It could also be used to solicit feedback from new hires by assigning a short survey a month or two after they join the organization.