Yes, Ragebound crates would have to come out next month to have three months before the Unfeathered crates release with Necrom in June. However, I don’t think new Crown crate seasons usually appear in the monthly showcase but have their own separate announcement later in the month.

Clockwork City stuff returned or was on sale this past month — perhaps next will be more Morrowind as we build toward Necrom?

new crates aren't in crown store showcases they get their own seperate article usually a week before release.