Hosting will remain free through the end of 2019, and thereafter, is estimated to cost $2/month for student paid subscriptions, and a fraction of the current MAA hosting fees for departmental subscriptions. These fees will help support WeBWorK community efforts. More details at edfinity.com/hosting, including a form to sign up for updates in the run up to summer.
An alternative for all users is the Edfinity homework system which is NSF-funded, centrally hosted, and provides a modern, seamless interface for WeBWorK problems. More details at edfinity.com/homework.
I've added the basic information about this to the wiki. Feel free to reach out to me or email@example.com or firstname.lastname@example.org