Does Census or BLS post a release schedule for the CPS supplements or say what supplements will be discontinued?

I am looking to find out whether Census/BLS are continuing some of the supplments, like the Unbanked/Underbanked Supplement, or refielding older supplements, like the Civic Engagement Supplement.

It looks like you can find a public calendar of Census activities, including scheduled data releases, here. The BLS release calendar can be found here. Additionally, you may want to consider signing up for their newsletters, which may include information about upcoming releases.