Maintenance for the week of October 27:
• [COMPLETE] ESO Store and Account System for maintenance – October 30, 9:00AM EDT (13:00 UTC) - 6:00PM EDT (22:00 UTC)
Please? I'd love to get my hands on a whole load of Celestial Nimbus (or Nimbi) for a housing project I'm working, and it won't be complete until I get my hands on those.
That was the last set of crates and they just left at the beginning of December, so I wouldn't expect to see those return for a while.
Most of the crate seasons (except for Wild Hunt and Dwarven) managed to show within a span of two years. The New Moons were the surprising ones that returned very soon after they left the store (8 months apart), but most seem to take a break of about 1-2 years before returning.